RingCeption - Ring Modulator/Noise Synth, Rookie design (help!)

[knutolai]

Hi everyone!
This is my first attempt at a (very) half-original design. Also its my first post on the forum! I'm posting this thread because I'm in need of help with my half-bad design (so far I have educated myself in electronics).
The RingCeption is a network of 4 pseudo-ring modulators (see the Noise 567). The network allows you to place every pedal in series AND parallel at the same time. The idea behind the op-amp buffers is to prevent positiv feedback in all situations (except when all RM's are connected in series).
ATM Im sending the input-signal through a zvex SHO in order to drown the modulator bleedthrough of the 567 chip. This is working well enough when the RM's are connected only in parallel, but not so much when I start feeding the RM's into each other. Another problem with the circuit is that the ground seems to be unstable. I get a high frequency bleedthrough and can hear the modulators if they are tuned to a high frequencies even when the pedal is bypassed (true bypass, common ground).
Does anyone have any suggestions/immediate observations to help me on my way? Any help is greatly appreciated! I know the whole concept seems a bit crazy, just bear in mind this circuit is meant for noise music

Schematic:


Also can anyone recommend me a very simple schematics software?

[knutolai]

Ok, so I have gotten a tip about putting a small size capacitor between pin 1 of the LM567's and ground to filter out HF overtones that might create electromagnetic noise in the tl074 op amp-buffers. Hopefully this will help. 

[superferrite]

Thanks for the reply about my Sam Ash fuzz, but this is over my head!  Good luck, my man!

[knutolai]

No problem dude! OK, you who might be following the thread: I haven't gotten around to do the mentioned fix, but came up with two other things to try out:
-Adding a 100uF capasitor and a 1N4001 between Vdd and Ground to filter out possible AC current and for polarity protection.

-modify the bypass switch to the following cofiguration:

B=Board

This is a true bypass switch that, when in the OFF position, connects the board input to ground and disconnects the power supply (no current for the TL074s, LM567s and the power indicator LED!), eliminating all HF noise/interference. I'm a bit uncertain about this last modification since I haven't really seen this bypass switching used in any other pedals. Is it harmful for the IC's to have their power turned on and off extensively?