I am going to outline some mods to this cool pedal which will unleash the full potential of the DSP chip used inside. The mods include addind a switch to allow all the effects to be selectted instead of the being restricted to the 4 effects EH have allowed. These extra effects include the flanger and chorus.
As well as the extra effects I will outline how mto add two extra pots for controlling the FV-1 parameters.
Here are some gut shots of the Holy Stain front and back PCB.
The pedal is mono in mono out and as well as the 4 programs (Room - Hall reverb, pitch shift and tremolo) has a built in fuzz effect as well.
(http://i90.photobucket.com/albums/k243/lenny1dog/P3080115.jpg)
(http://i90.photobucket.com/albums/k243/lenny1dog/P3080116.jpg)
The units digital effects are made with a Spin Semi FV-1.
I have traced out some of the FV-1 circuitry and its pretty much application sheet stuff as expected but only having one pot to control the digital parameter of the FV-1. The one pot does link to 2 of the controls pins, so adjusting the pot is adjusting 2 parameters at once.
It would be quite easy to mod this to pop in an external eeprom that we could put our own code on which would open up more possibilities for the pedal.
Ok here is a very cool thing that can be done to add these extra effects to the Holy Stain
Flanger
Chorus
pitch with echo
All that is needed is a SPST toggle switch and a bit of wire.
This is all that is needed to modify this :-
Pin 17 of the FV-1 is tied to 3.3v as standard, to access the extra effects pin 17 needs to be able to be switched either 3.3v or gnd
1. This can be done by lifting pin 17 of the FV-1 chip from the pcb, to do this heat up the solder on pin 17 and with tweezers or a stanley blade lift the pin until its floating off the pcb contact.
2. you then need to solder a wire to this pin (thin kynar wire is best) The wire is best glued down to the top og the chip or the pcb as we dont want this wire flexing and breaking the pin from the ic.
3. The final bit ! take your spdt toggle switch and solder a wire to each outer terminal. Now solder one end terminal to ground and the other to 3.3v. The centre terminal from the switch goes to the pin 17 wire that was previously soldered and glued down.
So when the toggle switch is in one position the effect select footswitch selects the 4 effects as normal, when the toggle switch is in its other position the effect select footswich will select the other 4 effects.
(http://i90.photobucket.com/albums/k243/lenny1dog/P3110119.jpg)
(http://i90.photobucket.com/albums/k243/lenny1dog/P3110123.jpg)
Here is Mod number two, the second control mod.
EH in there wisdom wired up one pot to two control parameters, what this means is that on there Tremolo patch as you turn up the speed of the tremolo it also adds in the reverb. At minimum setting of tremolo speed there is no reverb but as you increase the tremolo speed the reverb increases to max. As my first mod added some extra effects like chorus and flanger the use of the second control pot comes into it's own as you have independant control over the rate of chorus/flange independant of reverb. On the reverb only programs the second pot will adjust the high freq filter of the reverb.
I didn't bother adding the third control pot as in the programs all it does is change the effect output mix, EH added a seperate mix control for this anyway.
Here is the second pot mod. In the first picture i have highlighted the track that need modding in white. This is the centre pin of the pot to the two control pins on the FV-1 chip
(http://i90.photobucket.com/albums/k243/lenny1dog/potcontroltrace2.jpg)
First of all we need to remove the resistor R18 circled in red.
After the resistor follow the trace down under the FV-1 chip to the two pins on the chip that are connected together, the bit circled in GREEN , this track needs to be cut seperating the two pin of the chip (20 and 21). Even after cutting the track between the two pins we can still reverse the mod if needed by placing a blob of solder between the two pins on the chip . (nothing in these mods can't be put back to standard)
Next a wire from the top pad of the removed resistor need to soldered from there to pin 20 ( the lower pin in the white trace) This just recconects the pot to its original control pin.
Adding the second pot now is just as easy. Using 100k linear pot solder one end to the 3.3v and the other end to gnd or just conect each end to the ends of the pot that I have put the white trace on. The centre pin on the pot then goes to the other end of the R18 pad ( bottom pad R18)
If any of this is confusing just ask and i can answer every question, this second picture with the mod done should make it clear.
(http://i90.photobucket.com/albums/k243/lenny1dog/P3190124.jpg)
Many thanks for this!
The EHX Holy Stain is often available for a very reasonable price, perhaps precisely BECAUSE it does not fully exploit all the options of the FV-1 chip. Nice to know that it can be more than it already is, and based on knowledge easily and historically shared here.
Why do I feel that sometime in the near future we will be seeing a Holy Stain 2 with "Improved Control, Functionality, and more choices of Effects!" ::)
Exceptional work and contribution Mick!
I followed Ice-9's mod instructions and converted a cheap used Stain to something a lot more usable.
(http://i257.photobucket.com/albums/hh218/reverse_engineer/dad290d8.jpg)
This is awesome info! I'm going to start trolling ebay for one of these now.
some guys want ALL the KNOBS...
and then again they want even more control over teh FUZZ, too :icon_rolleyes: :icon_rolleyes:b :icon_rolleyes:
(a.o. the wisdom of E-H sometimes is the ART of REDUCTION !!!)
Right then !! If you want all the pots, You got-em.
1. lift pin 22 of the FV-1 from its solder pad so its just floating.
2. solder a wire from pin 22 to the centre of a 100kB pot.
3. One end of the pot to 3.3v, the other end to 0v.
Note.
EH put a 10k resistor from the centre pin of the pot to the control pin of the FV-1. (This isn't in the data sheet for the FV-1 but might be worth adding anywa to all the pots)
HINT.
It wouldn't be difficult to knock up a little daughter PCB for an external eeprom allowing you to put in your own programs like wah, distortion, phaser etc. or some of the many available programs to download from the Spinsemi site.
Quote from: Ice-9 on April 25, 2011, 06:42:18 AM
HINT.
It wouldn't be difficult to knock up a little daughter PCB for an external eeprom allowing you to put in your own programs like wah, distortion, phaser etc. or some of the many available programs to download from the Spinsemi site.
Hey Mick,
Brilliant work on this by the way! ;)
I was under the impression that the programs for download on the Spinsemi site were only "partial" programs ???
I thought they were only for testing and the sorts. I was unaware that they were fully-functioning programs that could be used with the FV-1. Am I wrong?
There's mixture of things in the "free DSP Programs" section some are just snippets of code for incorporating into other things, but there are some full programs in there, the Disco/DJ ones for example.
You can also download the programs for the Guitar amp and mixer applications, these are full ready to go programs. There's some nice effects in the guitar amp section, I haven't looked at the mixer ones so I don't know how suitable they are for stompbox use.
http://www.spinsemi.com/guitar_amp_application.html (http://www.spinsemi.com/guitar_amp_application.html)
http://www.spinsemi.com/mixer_application.html (http://www.spinsemi.com/mixer_application.html)
The forum also has a few full programs posted in it.
Quote from: puretube on April 25, 2011, 04:51:46 AM
some guys want ALL the KNOBS...
and then again they want even more control over teh FUZZ, too :icon_rolleyes: :icon_rolleyes:b :icon_rolleyes:
(a.o. the wisdom of E-H sometimes is the ART of REDUCTION !!!)
You worry about making a successful product and we'll carry on tweaking things for extra options. :)
Quote from: slacker on April 25, 2011, 09:33:32 AM
You can also download the programs for the Guitar amp and mixer applications, these are full ready to go programs. There's some nice effects in the guitar amp section, I haven't looked...
Ian,
I looked at the files. All of them seem to have the "DEMO" tag in them. They read "GA_DEMO_****....." This leads me to believe that they are not COMPLETE programs and are only suitable for demo applications. I suppose you could disect them and use the parts to form a complete code.
Am I still wrong?
I guess they call them demo programs because they're designed to showcase what the thing can do, in the same way as the internal programs the FV-1 ships with. They're fully working programs though, they just need compiling and burning to an EEPROM and they're ready to go.
Quote from: slacker on April 25, 2011, 10:02:44 AM
I guess they call them demo programs because they're designed to showcase what the thing can do, in the same way as the internal programs the FV-1 ships with. They're fully working programs though, they just need compiling and burning to an EEPROM and they're ready to go.
+1, they are indeed fully working programs, I have tried them all, some are great and some are not to my taste but you can either use them as they are or try and improve them. The good thing about them is that you can use these as a base to learn how the code works.
For instance the flanger/reverb patch, If I wanted to use the flanger and maybe i don't want the reverb in with the effect I could re-write that patch and just remove the reverb code.
There is also the internal chip effect programs available for download.
Quote from: puretube on April 25, 2011, 04:51:46 AM
some guys want ALL the KNOBS...
and then again they want even more control over teh FUZZ, too :icon_rolleyes: :icon_rolleyes:b :icon_rolleyes:
(a.o. the wisdom of E-H sometimes is the ART of REDUCTION !!!)
Riddle me this: Why does the "Clean" setting on the Holy Stain clip so much? That pedal would be really awesome if the clean setting was actually clean, and not set to "amp about the break up". I really don't understand that.
Just wait until people find out that they`ll have "digital" dry
plus "analog" dry in their mix
@ "chorus" & "flanger"
(like @ tremolo, already...) :icon_razz:
Quote from: culturejam on April 27, 2011, 05:12:01 PM
Riddle me this: Why does the "Clean" setting on the Holy Stain clip so much? That pedal would be really awesome if the clean setting was actually clean, and not set to "amp about the break up". I really don't understand that.
I'm not 100% sure, but from memory when I was modding the Holy Stain I think mine was clean when the fuzz section was set to clean. I sold the pedal some time ago so can't check.
Quote from: Ice-9 on April 28, 2011, 03:45:33 AM
I'm not 100% sure, but from memory when I was modding the Holy Stain I think mine was clean when the fuzz section was set to clean. I sold the pedal some time ago so can't check.
Mine is gritty, and so is the one I just moded yesterday.
But I just saw this on TalkBass:
QuoteWhen running the clean setting, you need to have the color NOT on Warm, and the tone knob close to all the way counter-clockwise or else it will still distort somewhat.
So I fired mine up and played around with the "color" switch. Warm is definitely the grittiest of the three. But all of them have some grit if I hit a chord more than somewhat lightly. And with the Tone control any brighter than 12 o'clock, I get grit. And even at 12 o'clock, there is a little grit, and the tone is quite dark even with my bridge pickup.
I suppose if I only played with vintage single coils (~5k), I'd never notice. But I'm a humbucker dude.
The fuzz and drive on the Stain are pretty decent, but I sure would love to be able to play clean without tiptoeing around the grit. That's why I'm anxious to see how the Ice-9 "Forum FV-1 Project" turns out. I'm all over that.
Quote from: culturejam on April 28, 2011, 08:29:41 PM
Quote from: Ice-9 on April 28, 2011, 03:45:33 AM
I'm not 100% sure, but from memory when I was modding the Holy Stain I think mine was clean when the fuzz section was set to clean. I sold the pedal some time ago so can't check.
Mine is gritty, and so is the one I just moded yesterday.
But I just saw this on TalkBass:
QuoteWhen running the clean setting, you need to have the color NOT on Warm, and the tone knob close to all the way counter-clockwise or else it will still distort somewhat.
So I fired mine up and played around with the "color" switch. Warm is definitely the grittiest of the three. But all of them have some grit if I hit a chord more than somewhat lightly. And with the Tone control any brighter than 12 o'clock, I get grit. And even at 12 o'clock, there is a little grit, and the tone is quite dark even with my bridge pickup.
I suppose if I only played with vintage single coils (~5k), I'd never notice. But I'm a humbucker dude.
The fuzz and drive on the Stain are pretty decent, but I sure would love to be able to play clean without tiptoeing around the grit. That's why I'm anxious to see how the Ice-9 "Forum FV-1 Project" turns out. I'm all over that.
Yeah the fv-1 project is still on but the last 2 months i've been struggling just to keep my head above water so haven't had any spare time to put to it. Soon hopefully.
Finished all the mods. It was working perfect prior to installing it in its box. now the color knob seems not to do anything. Any ideas?
Hi there :) !
1) get it out the box
2) make it work again
3) put it back to the box step by step
4) be careful about the grounding (maybe some part of the circuit is accidently touching the ground, or maybe you have a cold solder that behaves differently when you move the board to install it in a box)
btw, FV1 is awesome. I've tried all the free programs - they are all fully functional. There are super cool programs on the spin semi forum, too. I never liked dsp, but this little chip changed the world for me - so for the past 6 months or so I've been reading the documentation and experimenting with the chip.
Here is the pic of my pedal :
(http://i179.photobucket.com/albums/w313/markoph/th_020220132898_zps6d981f9c.jpg) (http://s179.beta.photobucket.com/user/markoph/media/020220132898_zps6d981f9c.jpg.html)
Bes regards,
Marko
Wow! Nice work, guy. Both in extracting more out of what so many consider a throwaway pedal, and i packaging it as the flexible unit it is. I'm impressed.
@Marko
I am familiar with the programs that you have listed on the right side of the pedal however,
Could you explain the programs on the Left? Most of them do not look familiar. ;D Where did you find them? What exactly do they do? Do they sound good? Sound clips? :o
Quote from: Mark Hammer on February 21, 2013, 09:30:51 AM
Wow! Nice work, guy. Both in extracting more out of what so many consider a throwaway pedal, and i packaging it as the flexible unit it is. I'm impressed.
Tnx Mark, it means a lot coming from you :)
Quote from: Govmnt_Lacky on February 21, 2013, 09:40:24 AM
@Marko
I am familiar with the programs that you have listed on the right side of the pedal however,
Could you explain the programs on the Left? Most of them do not look familiar. ;D Where did you find them? What exactly do they do? Do they sound good? Sound clips? :o
Ofcourse :)
I have found all of these effects on a spin semi site and forum, some are modified by me but mostly just a little bit. The main credits goes to to guys on the forum and Frank (OCT distribution)
1 - octaves - dry, -1 oct, +1 oct (like a micro pog, not aaaaaaass good, but very very good :) ) - from the forum
2 - shimmer (verbzila like) - it is just beautiful :) - from the forum
3 - hold plus pitch plus filters - from the SS site (it works great! I used the infinite reverb algoritam to get hold (freeze like) function). Using it w/ expression pedal is very powerful (filter sweep changing)
4 - just like 3 but w/ 4 pole filter - from the SS site
5 - delay w/ chorus on repeats (optionaly) - from the forum
6 - classic ring mod - from the forum
7 - whammy - from the forum - I use an expression pedal for it
8 - reverse delay - not perfect, w/ some clicks, but it's ok (needs more work) - from the forum
I do not have yet classic sound samples (just recording from rehearsals), I shall record some soon and post it.
I hope this will not go too far in OT, because people expect to read about HS here, but let me say only this:
FV1 is excellent. As for reverbs, I have no words how good they are. Also, bunch of other modulation effects are doable in a more or less complex way. I hope I'll menage to finish the build report for the both forums, and to share my experience soon. As always, there is so little time :-\.
Regards,
Marko
If anyone is still interested in the FV-1 (I done the original mods to the Holy stain in this thread) I have been working on a 1590b size enclosure size single sided 90%through hole PCB for a FV-1 which is close to release, I just have to get all the files into one place.
It has full External Eeprom with a programing port built in so no need to remove Eeprom or disassemble the pedal to program it. and uses a standard pot to change patches , so there is no need for a bulky or expensive binary/data encoder switch.
If anyone is interested I will get this all sorted and posted in a new thread.
Oh here is a little gut shot of thing
(http://i90.photobucket.com/albums/k243/lenny1dog/6c512a4a-05fa-412f-9f19-fababb15c814_zps1026baa8.jpg) (http://s90.photobucket.com/user/lenny1dog/media/6c512a4a-05fa-412f-9f19-fababb15c814_zps1026baa8.jpg.html)
I bought a Holy Stain 2 years ago with the intention of modding it for an external EEPROM. I finally got around to doing it!
http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_1.jpg.html (http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_1.jpg.html)
http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_2.jpg.html (http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_2.jpg.html)
I added all three pots as I wanted to use them all in my own programs even if the onboard progs don't use them. I left the expression pedal jack connected to POT 0. I thought about adding a switch to make the parameter it controls selectable but hey - why not do it in the software?
I have been programming the EEPROMs with PonyProg2000:
http://www.lancos.com/prog.html (http://www.lancos.com/prog.html)
So far, so good - I am pretty impressed with the results and it is really easy to do. If you weren't too concerned with the pots and switches mounting on the front of the pedal it would be even easier. I'm anxious to try Digital Larry's SpinCAD out but I've had a lot of fun just with stuff I downloaded from the FV-1 forum.
- soffa
Quote from: Ice-9 on May 12, 2013, 03:11:44 PM
If anyone is still interested in the FV-1
I am! :D
Is there a schematic to look at?
Thx
DL
Quote from: soffa on August 18, 2013, 04:00:19 PM
I bought a Holy Stain 2 years ago with the intention of modding it for an external EEPROM. I finally got around to doing it!
http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_1.jpg.html (http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_1.jpg.html)
http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_2.jpg.html (http://www.aronnelson.com/gallery/main.php/v/Schematics-etc/Holy-Stain_Mod_2.jpg.html)
I added all three pots as I wanted to use them all in my own programs even if the onboard progs don't use them. I left the expression pedal jack connected to POT 0. I thought about adding a switch to make the parameter it controls selectable but hey - why not do it in the software?
I have been programming the EEPROMs with PonyProg2000:
http://www.lancos.com/prog.html (http://www.lancos.com/prog.html)
So far, so good - I am pretty impressed with the results and it is really easy to do. If you weren't too concerned with the pots and switches mounting on the front of the pedal it would be even easier. I'm anxious to try Digital Larry's SpinCAD out but I've had a lot of fun just with stuff I downloaded from the FV-1 forum.
- soffa
Thanks sofa, I also did the same thing adding an external eeprom which I posted the info and pcb last week but seems to have disappeared, Pretty much the same as what you have done. Good work.
Repost of the Eeprom mod as it seems to have disappeared.
Here is a quick guide for adding an external Eeprom to the EHX Holy stain so that it can be used to load any program you want, this makes the Holy Stain a very good and cheap Dev board for anyone wanting to have a play with the FV-1 reverb/multiFx chip. If you also have done my previous mods then it will fully open up the possibilities for having some FV-1 fun.
First the PCB and connection picture.
(http://i90.photobucket.com/albums/k243/lenny1dog/ExternaleeprommodforHolystain2_zpscde03472.jpg) (http://s90.photobucket.com/user/lenny1dog/media/ExternaleeprommodforHolystain2_zpscde03472.jpg.html)
Connections are as follows.
1. 3.3v and ground = Any 3.3v and ground connection on the PCB
2. Int/Ext switch = Purple wires, to a SPST switch
3. Three Blues wires marked 13,14,15, These go to the FV-1 chip.
Solder the wires from the Eeprom labelled 14 and 15 directly to pins on the FV-1 chip (14 and 15)
13 = pin 13 will need to be lifted from its solder pad on the main pcb so that it is floating freely just as I describe in the other mods and then a wire from the new Eeprom board point 13 soldered directly to the floating pin of the FV-1 (after doing these 3 connections apply some epoxy resin or hot glue around this so that the pin does not snap off. This can be seen in the picures of the other mods)
4. The programming wires on the external Mod PCB, coloured light blue and green, These 3 wires can be used to reprogram the Eeprom and are ground, data and clock. If you would prefer to use a socket for the Eeprom and program it off board then there is no need to connect these 3 wires, Alternatively these 3 wires could be soldered directly to a stereo mini jack socket and mounted to the enclosure making reprogramming possible without even removing the chip or in fact no need to even remove the pedal cover.
As I have quickly typed this up there may be questions you need to ask before modding, so anything you need to know just ask in this thread.
Ohh I almost forgot the Eeprom is a 24lc32a and the resistor is 10k and as its so simple a pcb making it fit on any other type of board would be a 5 minute job.
NB Slight erron on pcb..... pin 7 of eeprom should go to ground instead of +ve is onboard programming is required.
Ice-9...
I saw your post at fsb and it made me get off my tail and dust off the holy stain - thank you!!!!
Quote from: soffa on August 18, 2013, 06:52:33 PM
Ice-9...
I saw your post at fsb and it made me get off my tail and dust off the holy stain - thank you!!!!
Oops ! that explains why I thought the post had disappeared here, I must have only posted it at fsb. Have you tried any other effect software in it yet?
The HolyStain turns out to be a good dev tool for FV-1 effects once all those mods are done.
I am jumping in a little late, but I have a working FV-1 test pedal i built in recent days and an MPLAB programmer for the EEPROM(which works great). I am interested in talking to anyone about their experience in learning the programming environment. Also wondering if the Holy Stain is a pedal that stands well on its own without modification. I will surely modify it if I buy one.
Hello ! I have a problem with my holy stain.When it is on the bypass mode i have the guitar signal.When i turn it on the led are lighting but i have no sound.Can you please help me?
This is unbelievably awesome and has led me to repurchase the holy stain. How do I program the 24lc32a? I'm completely new to this and stumbling through google results.
Thanks!