I use C0G capacitors for timing on 3340s. They can have wide tolerances but this can be trimmed out with trimpots. The advantage of C0G capacitors is that they have very good thermal stability.
I don’t think if it’s a hard and fast rule, but in general.attenuators on inputs are labelled ‘gain’ and on the output ‘volume’. That’s how I call them anyway. Gain isn’t necessarily over-unity (amplification)
One advantage of gain pots on synth modules is that you can use one module output to drive multiple module inputs at different levels.
Additionally, pots on the inputs can be used to prevent overloading a module. Output pots aren’t any use for that.
Drifting from the topic, but I’ve seen mixer circuits where there’s an inverting summing stage followed by a second inverting stage where the input resistor is a pot, or there’s an attenuator before the second stage input resistor (maybe labeled “gain”). It baffles me why anyone would do that, controlling the gain after the first stage. Granted, there are pots on the inputs, but if the first stage is clipping you have to turn all of them down. Instead of the pot on the second stage input, there could be a pot on the first stage feedback.
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