Does this switching system make sense?

[mafew129]

I have this idea for a multi fx unit with a channel selector. Each effect can be assinged to channel 1, channel 2 or both. This is done with 2 spdt toggles. Then channel 1 or 2 can be selected with a stomp switch.
From the input I have a tl074 buffer which splits the input into 4. (http://img24.imageshack.us/img24/6959/quadbuffer.gif)
These 4 outputs go to each input of each effect.
Then from each output of each effect I have a tl072 buffer which splits the output of each effect into 2.
Is this too many buffer? Does this switching system make sense? Is there an easier way to do this? Does this make sense?

Thanks in advance for looking.
Sorry for the crude drawing

[Processaurus]

Hi, from looking at your design, one concept that would be good to understand is that outputs of most effects (and buffers) are low impedance, which means the active, driving component (probably an opamp or transistor) in the output stage tries to drive whatever load you put on it with as much current as is necessary to keep the output signal at the amplitude it should be.  Because it can source a good amount of current, it is bad to put a very heavy load on a circuit output, such as connecting it directly to ground (an infinite load) or another output.  When you abuse an output by connecting it directly to ground, the active component pulls the maximum current it can to try drive the load, which would either burn a simpler part up, or in modern opamps, make it go up to the current limit it has before its short circuit protection kicks in. Similarly, if you tie two or more outputs directly together, they will try to fight each other to the death to generate the output signal they are trying to.  At some point one will be trying to pull high while the other is trying to pull low, and whichever is stronger will win.

To successfully combine signals together, you need a mixing circuit, the simplest of which is a resistor between the outputs and the summing point, which alleviates the heavy loading on the outputs.  Some things to look up for further reading are "impedance" and "summing amplifier".