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 353 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.

[psycopathicteen]

I'm still working on this occasionally, I was just busy with my homebrew game and the Gradius III optimization patch.

I just had an idea to simplify how sample loop points will work. Instead of defining the sample length and oscillator frequencies independently, they can be defined by parameters in a math equation.

loop length = (fundamental wavelength)*(waves per loop)
oscillator frequency = (harmonic frequency)/(fundamental wavelength) + (detune amount)/(loop length)

The higher the waves per loop, the smaller the detune amount steps are from each other. The attack portion of the sample, can be any length in blocks, and the software ADSR parameters on the oscillators will freeze during the looped section.

[turboxray]

I'm still working on this occasionally, I was just busy with my homebrew game and the Gradius III optimization patch.

I just had an idea to simplify how sample loop points will work. Instead of defining the sample length and oscillator frequencies independently, they can be defined by parameters in a math equation.

loop length = (fundamental wavelength)*(waves per loop)
oscillator frequency = (harmonic frequency)/(fundamental wavelength) + (detune amount)/(loop length)

The higher the waves per loop, the smaller the detune amount steps are from each other. The attack portion of the sample, can be any length in blocks, and the software ADSR parameters on the oscillators will freeze during the looped section.

What's your Gradius optimization patch about? Does it use the original processor???

[psycopathicteen]

https://www.romhacking.net/forum/index. ... ic=27609.0

I'm Aaendi.