With that many modules, I'd try to arrange things to make each row an independant, standalone synth.
It's a good sorting exercise at least, and helps fix your arrangement into memory.
Where's the output going to come from? Is there a mixer and I missed it?
And the usual: needs more mults and offset/attenuators and other boring things.
Are you running mono or stereo?
Who's going to be the usual master clock? Will it need to clock many other things?
Will you need a reset circuit to sync clocks and counters on restart?
That's an interesting collection you have.
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