N163 lowpass filter doesn't affect multiplexer hiss about dn-famitracker HOT 5 CLOSED

two factors has affected this:

• the new Mesen N163 emulation core #152
• lowpassing does not necessarily remove hissing, as by its nature, lowpassing happens as a curve.

in the meantime, you could either disable multiplexing or try a lower lowpass frequency

from dn-famitracker.

I just played this back on a real N163 cartridge. Unsurprisingly, the result is horribly hissy.

In the tracker, lowpassing it doesn't work, but there is a multiplexer toggle built into the tracker. For hardware recordings, I often notch out the main multiplexing frequency with a frequency list that gives me the multiplexer frequencies to filter out. Still not perfect, but it really does solve the biggest issue. Probably suitable if the multiplexer must be left on, I guess.

Simply lowpassing the multiplexer won't work, as lowpassing only gets stronger the higher you go. A notch filter, however, stops the undesired frequency right in its tracks.

Again, the simplest solution is simply turning the multiplexer off using the tracker's own multiplexer toggle feature.

I personally don't hear an issue otherwise. The playback sounds as intended, especially relative to hardware.

from dn-famitracker.

I specifically remember Persune mentioning that the lowpass would take care of the multiplexer hiss, so I kinda thought that's what it was for. If that's not gonna happen I can just keep notch filtering songs or disabling it though.

from dn-famitracker.

the lowpass filter was meant to emulate the (poorly designed) RC lowpass filters on real N163 carts, if you rely on it to filter multiplexing, set the cutoff frequency lower to account for the rolloff

from dn-famitracker.

Fair, I guess I should close this then.

from dn-famitracker.