SNES music program

[calima]

Well, he could develop a mic that passes data via the controller or expansion ports

[psycopathicteen]

I've updated it quite a bit.

To make a user defined instrument, set the instrument parameter to 3, and press left or right to go to the user defined instrument screen. Sample size is (N+1)16 where $0000 is 16 samples, and $03FF is 16384 samples. You can mix up to 4 oscillators. The "wave" parameter doesn't do anything yet so just ignore it. A frequency of $0400 is "normal". In order to hear it, you must press render to update the BRR sample to the SPC700 chip.

[Drew Sebastino]

What are the controls? I can move the cursor around, but I haven't been able to make anything happen beyond that, unfortunately. It might be a good idea to include a readme file at some point for if you plan on distributing it outside of NESDev. Fantastic work, by the way.

[psycopathicteen]

It uses the keyboard and the mouse.

[Drew Sebastino]

Okay, I see now. I wasn't expecting whatever is mapped to the start button to enable you to modify the values.

[psycopathicteen]

I've been starting to work on this thing again, and I'm wondering how much of a difference there will be between a BRR sample using only filter 0 (raw 16-bit PCM) blocks and a BRR using all 4 filters. I got the range bits working, but not the filter bits.

[lidnariq]

The filter bits "just" let you trade off some amount of sharpness for some amount of reduction of quantization noise. As to how to decide when is appropriate? Last time I said to pick it as a function of what desired frequencies exist in your output, and use the filters to remove higher harmonic content.

[psycopathicteen]

music engine.zip

(22.27 KiB) Downloaded 248 times

Now you can use 4 waveforms for the additive synth section:
1: square
2: 25% pulse
3: 12.5% pulse
4: sawtooth

The part that does BRR sample conversion automatically decides if sample blocks use filter 0 or filter 1. I didn't implement anything with filter 2 or filter 3 yet.

[psycopathicteen]

I just got the system to do a complete conversion from PCM to BRR. I think I'll hold off posting an update until I have some more features. I think I'll do add FM synth next.