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Mixer
Registered: Apr 2008
Posts: 422 |
Software Synths
There are some music tools and programs made for stock c-64 which produce sound or music, but are not necessarily using sid chip the usual way.
Such as:
SAM,
radwar speech,
the ESS speech,
Galways drums,
AndyM00's pulsetrain stuff,
Soundemons new waveform-stuff,
THCM Mod players,
Some of the Vicious Sid I and II routines,
Mahoneys many achievements,
Algorithms VQ packed players,
Censors various pwm players,
Eebens Pollytracker,
Retroskoi
We can observe that several c-64 musicians and coders have experimented with software based synthesis or sampling/compression over the years.
Most of the listed are rather recent. There must be plenty more weird sound routines done during the last 30 years that are not yet listed.
If you know of some past oddness that should be on the list - published or unpublished, please, paste a link or desrcibe. Would be interesting topic for discussion and perhaps someone gets a new idea. |
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algorithm
Registered: May 2002
Posts: 702 |
Ice guys Ice Guys
Uses 2bit via waveforms |
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chatGPZ
Registered: Dec 2001
Posts: 11108 |
Quote:Anyway, since it is on oscillator+filter, it should work also with 8580?
that made me wonder as well - as it clearly doesnt work on 8580 at all :) |
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McMeatLoaf
Registered: Jan 2005
Posts: 105 |
Quote: no idea :) A.C.E. is another one that plays samples in unconventional ways (didnt investigate further yet, my guess is that it uses the noise waveform somehow)
Perhaps something like turning the testbit on/off? |
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Mixer
Registered: Apr 2008
Posts: 422 |
Customer:"I can't play samples on my C-64"
Support:"Have you tried turning the test bit on and off again?" |
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Zyron
Registered: Jan 2002
Posts: 2381 |
:D |
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Frantic
Registered: Mar 2003
Posts: 1627 |
"Customer: No I didn't test that." |
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McMeatLoaf
Registered: Jan 2005
Posts: 105 |
Haha, I meant setting waveform of channel 1 to pulse, then setting pulsewidth to max(?) and THEN turning testbit on channel 1 on/off. :D
Similar playback routine to the one in Last V8, but at a much lower sample rate. |
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mankeli
Registered: Oct 2010
Posts: 110 |
Here's my attempt at soft synthesis on the breadbox:
Your Love
Basically the routine counts cycles between iterations with cia timer. The oscillators (16bit phase accus iirc) are then advanced by this amount, and the resulting samples are then played back with soundemon's waveform sample method. Music routine itself happens in irq.
Theoretically this works with badlines/sprites as well.
Try setting D011=7f if you want to hear some (more) intermodulation distortion. |
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4mat
Registered: May 2010
Posts: 63 |
Dunno if this counts. Type Mismatch generates it's digi drums by sampling the 3rd sid channel. |
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algorithm
Registered: May 2002
Posts: 702 |
I have a oscillater synth ready which uses free running oscillators to generate audio that is encoded using samples as source.
Raster usage is a few rasterlines. and uses three oscillators to recreate the speech. No other cpu intervension required apart from writing a few values once per frame. It somewhat works well for musical instruments as well. Compression is around 175 bytes per second uncompressed (if using three channels)
https://www.dropbox.com/s/tcps4e9s2o43sc5/testmadonna.prg
The encoder is designed to have individual sustain values for each channel, however there are issues with this at the moment, hence i am averaging the three sustains per frame and feeding this to $d418. Due to this, there will be some noticeable clicks on 6581 sid. Use 8580 for more smoothness.
To implement interpolation multispeed to keep the same data usage per frame and to increase the output quality. |
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