Atari Punk Console with sequencer to multiple inputs

[bcnx]

Hi all,

I designed an APC circuit with two APCs on it and a step sequencer, which basically cycles through a series of potmeters with a 5V voltage to it.
When I route the sequencer to one discharge pin on the 555 IC, it works fine, but I would like to be able to route it to more potmeters (4 in total).
When I do that, things stop working.
I figured a solution might be to use a buffering opamp. This does not work however, because the output current is too high. When I lower the current with resistors or voltage dividers, the sounds comes back, but it is different from where the sequencer connects to one discharge input on the 555.
What is needed, I think, is a way to copy/buffer the voltage AND current of the sequencer to every 555 discharge input.
Anyone a hint on how to do that?

cheers,

BC

This is the circuit: https://www.circuitsonline.net/forum/file/34912/forum-post