question: how to built a random octave fx

[FUZZZZzzzz]

hi guys!

i was thinking about the idea of building a random octave fx. so, random drops and peaks while playing... has anyone done this before?
i want to built it as a xtra function in a build.

thanks!

[Top Top]

Do you want the octave to jump around at random? OR The octave to come in and out at random?

Both could be done with something like Tim Escobedo's PWM as a basis, and then some other CMOS dividers/counters/etc... for the octave and weirdness.

[FUZZZZzzzz]

Do you want the octave to jump around at random? OR The octave to come in and out at random?

GOOD QUESTION!.. both will be fun..

Both could be done with something like Tim Escobedo's PWM as a basis, and then some other CMOS dividers/counters/etc... for the octave and weirdness

thanks for your suggestions.. i will look into it..

[rousejeremy]

Random Number Generator? http://www.youtube.com/watch?v=4r6A6rqI9xo

[Mark Hammer]

Build the MXR Blue Box and reduce the gain on the input stage a little bit.  That ought to get you enough random sudden octave appearance.

[FUZZZZzzzz]

merci a bunch! so.. random weirdness often comes with fuzzy / overdriven signal.. or is a more clean approach also possible?

[Eb7+9]

random drops and peaks while playing... has anyone done this before?

www.diystompboxes.com/analogalchemy/sch/shocktave.html

stick a variable gain amplifier in front of Joe's sickly cool circuit and you'll get tons of what you're looking for ...
assuming you're talking octave DOWN

[CynicalMan]

Random Number Generator? http://www.youtube.com/watch?v=4r6A6rqI9xo

+1

This is similar:
sites.google.com/site/distorque/home/projects/pitch-incinerator

For clean octave, you might as well get one of these, three of these, and kick it around as randomly as you can. 

[FUZZZZzzzz]

Random Number Generator? http://www.youtube.com/watch?v=4r6A6rqI9xo

+1

This is similar:
sites.google.com/site/distorque/home/projects/pitch-incinerator

For clean octave, you might as well get one of these, three of these, and kick it around as randomly as you can. 

i love you guys!.. i thought i was the only one with ideas like that..

[Mark Hammer]

merci a bunch! so.. random weirdness often comes with fuzzy / overdriven signal.. or is a more clean approach also possible?

Guitar signals are inherently variable.  The 4013 flip-flop that is used in so many octave-down units requires a certain signal level, or rather, has a threshold level that must be crossed, for it to transition from flip to flop (i.e., from one state to another).  If you want random octaving, you simply have to ride that threshold so that it gets crossed intermittently, rather than consistently.

[R.G.]

Build an octave up and an octave down. Use semiconductor switching to choose between the three. Drive the selector inputs with random digital sequences.

It's more reliable that way.

[FUZZZZzzzz]

Build an octave up and an octave down. Use semiconductor switching to choose between the three. Drive the selector inputs with random digital sequences.

It's more reliable that way.

- build an octave up and octave down... check
- Use semiconductor switching to choose between the three (you mean the up / down and normal in to out signal?)
- Drive the selector inputs with random digital sequences.  (how do I do that? can i take a piece of an existing design?)

[FUZZZZzzzz]

Build an octave up and an octave down. Use semiconductor switching to choose between the three. Drive the selector inputs with random digital sequences.

It's more reliable that way.

- build an octave up and octave down... check
- Use semiconductor switching to choose between the three (you mean the up / down and normal in to out signal?)
- Drive the selector inputs with random digital sequences.  (how do I do that? can i take a piece of an existing design?)

Can someone point me in a direction, concerning the following?

- Use semiconductor switching to choose between the three (you mean the up / down and normal in to out signal?)
- Drive the selector inputs with random digital sequences.  (how do I do that? can i take a piece of an existing design?)

thanks

[R.G.]

Can someone point me in a direction, concerning the following?
- Use semiconductor switching to choose between the three (you mean the up / down and normal in to out signal?)

Go read http://www.geofex.com.You'll find all of it very helpful, and it will pre-answer a lot of questions you haven't thought of yet. But in particular, you want to look at http://geofex.com/FX_images/pseudorandom2.pdf and http://geofex.com/Article_Folders/cd4053/cd4053.htm

[FUZZZZzzzz]

thanks for the directions!!! appreciated!!!!