Hi,
I know that this forum is for stompboxes but since I didn't get any replies in ssguitar forum I thought you guys can maybe help me.
I have a pathfinder 10, here is the schematic :

This amp have 2 problems :
A- volume is not very usable, and seems to be linear
B- when I switch to overdrive channel, gain suddenly goes up and altering the gain knob should have transition between overdrive to distortion, but goes to full on distortion even at 9 o’clock.
This topic
http://www.ssguitar.com/index.php?topic=3440.0 answered a lot of my questions. since its old and OP's last visit was long ago I've decided to post a new topic.
as mentions in the other topic the main changes I should do is :
A) changing linear volume pot to a log pot.
B) changing gain pot to a anti log pot
Pot labeles on my amp are: B104 for gain, ALPHA B50Kohm for treble, A50Kohm for bass, ALPHA B50Kohm for volume.
1) my first questions is : can I swap bass pot with volume pot ? won't there be any problems with bass (other than it being linear)?
2)Should I use anti log pot for gain ? if so, how can I change a linear pot to anti log ?
3)also for the diode clipping stage I thought of implanting a limiter (diode ladder) like this :

which was posted here:
http://www.diystompboxes.com/smfforum/index.php?topic=108510.0so that I have better transition from crunch to overdrive and finnaly distortion. My question is how can I figure out how many stages I need and what resistor values should I use ?
4)Is there any other way of improving this amp that you can think of ?
I would be grateful to any help you are kind enough to provide.