You're correct IC17 are the tone oscillator. There are a minor difference for the snare module where the output low-pass filter (R120/C22) are not implemented.
You could measure and compare output of VCAs (IC9/IC10 CA3080 pin6) from a couple of module cards to check if the the OTA is defective. If you find you need to replace one of them this page might be of interest.
You could measure and compare output of VCAs (IC9/IC10 CA3080 pin6) from a couple of module cards to check if the the OTA is defective. If you find you need to replace one of them this page might be of interest.
hans