Grubb
Well-known member
I have a Greer of Tone (Mach1 & Southern Belle dual pedal) project in mind. I'd like there to be order switching, but I'd also like to add an additional switch function. Ideally, the switch would modify the Southern Belle to be more like a second Mach 1, because the Greer LS sounds amazing when stacked with another LS. I think this should be possible because of the high degree of similarity between the circuits, but I don't know where to start.
In the Mach 1 Mods thread (click here) - one of the most interesting threads I've seen on this forum - we find out that a real Greer Southland is actually built on a Lightspeed PCB, with very slight modifications:
R4 also has a value of 4K7 in the Mach 1 and 12K in the Southern Belle. Otherwise, both circuits are identical.
What drives the gain difference between both pedals? Is it pot values, the IC or the additional diodes? It seems like it would be easy to make the diodes switchable in and out, would this have a noticeable effect? Would it be possible to have even 3 diode options such as OFF, BAT41, and a 3rd option?
Thanks for any suggestions you might have for this project.
In the Mach 1 Mods thread (click here) - one of the most interesting threads I've seen on this forum - we find out that a real Greer Southland is actually built on a Lightspeed PCB, with very slight modifications:
LS:
a100 vol, a10k tone, a500k gain pots, 5 1n914 diodes and a opa2134 ic
SL:
a 250k vol, a10k tone, a1meg gain, 5 1n914 plus 2 extra Bat41's diodes in the loop and a tl072 ic.
R4 also has a value of 4K7 in the Mach 1 and 12K in the Southern Belle. Otherwise, both circuits are identical.
What drives the gain difference between both pedals? Is it pot values, the IC or the additional diodes? It seems like it would be easy to make the diodes switchable in and out, would this have a noticeable effect? Would it be possible to have even 3 diode options such as OFF, BAT41, and a 3rd option?
Thanks for any suggestions you might have for this project.