Cmoy as Keyboard/Audio mixing amp -- IGNORE

[johnnyb3]

Sorry, gang -- will repost to DIY (but can't figure out how to delete this post...)

Hi,

Complete noob here, but I've tried to read up on stuff before posting here, so apologies if I didn't do enough homework.

My situation is this: I have an electric piano with a preamp that brings it up to line level. I'd like to build a little mixing headphone amp so that I can either play the piano straight or mix it with an audio signal. I'd also like the option of a mono mix, because there are some play-along CDs that have the piano track entirely in one channel, and you're supposed to play along with the other channel with bass and drums. Hope that makes sense. Anyway.

My plan is to use a cmoy-type design together with a really crude passive line mixer (just a couple of series resistors on each side); after that in the signal I plan to add another such mixer that I can switch in and out to take it down to mono and then split back out to both sides of the output.

My obvious question is whether this whole idea is cockamamie! Aside from that, any advice about the type/quality of switch that should be used in the audio path?

Thanks in advance for any and all advice -- great forum.

John