Footswitchable gain/overdrive boost

[alerich]

Yesterday I picked up a Christmas gift to myself - a Yamaha T50C combo - the one with the pre-SLO style circuit designed by Michael Soldano. Great little amp. Two channels, nice cleans, tons of gain, fully independent EQ/Vol/Reverb controls for each channel. Check one out if you get a chance. It uses a single on/off footswitch to change channels but that wasn't included. I stopped by Guitar Center on the way home and grabbed a generic two button footswitch with a TRS plug. I have been thinking about what I can do with that other switch if I install a TRS jack in the amp.

This is one idea. I'm thinking about adding an overdrive/gain boost to the lead channel by simply adding a resistor to ground path of the overdrive gain control that can be bypassed by the switch. The amp has a nice rhythm crunch with the lead channel gain at 5 and a nice lead tone with the lead channel gain at 7. I have attached a photo to illustrate what I mean (sorry for the crummy photo but it's the only schematic I have). Seems like it should work but I wanted to offer it up for any second opinions in case there is something I am missing. It could also be implemented as a pre-set but switchable raw control in the lead channel's mid control ground path. A third idea is to insert it in the master volume pot's ground path for a volume boost. They all would be essentially the same installation as the pictured pre amp gain control.