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And one other point: DO NOT put any of your audio modules in close proximity to a power supply...as in, power supply module next to a VCO or VCF or so on. Reason here is that some switching-type modular supplies can be noisy, and that noise can get into audio fairly easily. Next to the Pam's is fine, though, since noise induced in modulation modules will be far less noticeable than in audio.