Modular synthesizer signal buffering

[alkopop79]

I'm planning to build a modular synth using Sound Semiconductor's VCO, VCF and VCA chips:

https://www.soundsemiconductor.com/

The datasheets are clear about building circuits but I wonder, do I need to add opamp buffers at the audio ins and outs of each module?

 

[rsavas]

It would depend on your loading. They state 6mA sink or source on the outputs.

 

[alkopop79]

Thank you!