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Here is a reply that I sent to the group some time ago when someone else was having the same problem:
First, some info:
On IC30(gate Array) the relevant pins are:
Pin 56: Bass Drum
Pin 57: Snare Drum
Pin 59:Low Toms
Pin 60:Mid Toms
Pin 61:High Toms
Pin 62:High Hat
Pin 63:Rimshot/Cowbell
Pin64:Handclap/Tamborine
The problem sounds like you may have severed one or more traces that run under the gate array. To fix this, all you need to do is to solder 3 jumper cables. They are:
From pin 13(IC29) to pin 9(IC33),
From pin 10(IC40) to pin 3(IC34), and
From pin 12(IC29) to pin 3(IC34).
Those 3 jumpers will re-attatch all the leads that need to run underneath the Gate Array(IC 30).
---In tr-707@yahoogroups.com, <recompas@...> wrote:
So finished up doing the pitch mod on my 707 (first try for this) using a cd40106 hex schmidt trigger chip to make 6 oscs. One for the BD, SD, all 3 toms, Cowbell, Tambo and HiHats. The pitch mod works great but I'm having a strang issue with certain sounds not coming through on their own mixer channels. The low tom comes through the BD channel, and the low tom slider does nothing. Similarly the SD comes through the Tambo channel. I unsoldered the legs of the gate array chip to use for the clock inputs, and I'm wondering if maybe those traces they were connected to may have been broken. Would that affect the routing of the audio I assumed it just had to do with the clock. Any pointers on where best to start debugging would be great. Sorry if this is a duplicate msg too, I tried to post yesterday but I don't think it was successful.
-T