You could make a LED/LDR combo, using an esp32 etc on bluetooth or wifi to control a pwm LED, which is shrink tubed facing an LDR that then connects to your stereo replacing or possibly in parallel to your pots.
You could make a LED/LDR combo, using an esp32 etc on bluetooth or wifi to control a pwm LED, which is shrink tubed facing an LDR that then connects to your stereo replacing or possibly in parallel to your pots.