Mono patch for SNES games?

[NinjaNAH]

Is it possible for a universal SNES patch to set audio to mono instead of stereo?

The setup I use only outputs the left sound channel, and it bugs me that some sound is absent/quiet. Would anyone be able to help with this?

[FAST6191]

Merging channels/downmixing in external hardware is probably the easier option, you might even get away with the reverse of a headphone doubler/bridged outputs but I don't know if there is anything waiting to bite me there. The "my first electronics project" audio amplifier that many go in for is also likely to be trivially tweaked into a downmixer as well.

https://problemkaputt.de/fullsnes.htm#snesexpansionportextpinouts does mention a mono audio out if you are rocking hardware. Seen a few SNES modifications to do fun video outputs, not so hard to run a wire and drill and ream (seriously pick up a handyman's reamer/tapered reamer and drill undersize) before soldering on a cable of your preferred style (female phono would be my choice but you do you) you cannibalised.

However unlike some other systems I am not seeing anything in the APU registers that you can twiddle to force a mono/downmix (for graphics on many systems you can often shove something in a vblank routine to twiddle a register that sets a graphics option every frame so you can do hacks that way, as audio registers tend to also be read/write or writeable then same idea if the option presents itself though I have only really seen it in audio stuff for volume control/manipulation).
That said I am very far from the best SNES audio hacker around here so I will leave the forest for the trees thing above.

[JP32]

Is it possible for a universal SNES patch to set audio to mono instead of stereo?

The setup I use only outputs the left sound channel, and it bugs me that some sound is absent/quiet. Would anyone be able to help with this?

It would be easier to buy this adapter:



I've used reverse of this to get dual mono audio output out of my nes.