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Forums > C64 Composing > Software Synths
2014-03-03 15:07
Mixer

Registered: Apr 2008
Posts: 311
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If you know of some past oddness that should be on the list - published or unpublished, please, paste a link or desrcibe.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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2016-11-09 15:57
Mixer

Registered: Apr 2008
Posts: 311
Adding Concert to the list:

Concert

The bassist in the sound-check part is actually a very simplified Karplus- or "digital waveguide-" synth.
2016-11-09 17:46
Radiant

Registered: Sep 2004
Posts: 637
More or less everything by Cycleburner/Megastyle?
2016-11-09 18:38
Hein

Registered: Apr 2004
Posts: 841
GBK-Test by ATOO

An experiment I did with channel 3 envelope mixing into the D418 samples (not really synths): D418 + D41C mix

Personaly I like Galway's Arkanoid generated drums 'n bleeps alot more than the drums in Arkanoid (alternative drums).
2016-11-09 22:06
bugjam

Registered: Apr 2003
Posts: 1789
Quoting Hein
GBK-Test by ATOO


In which form was it released? Anyone got the respective executable?
2016-11-09 23:25
Mr. SID

Registered: Jan 2003
Posts: 365
NESsivE ATtaCK and Phasor Soundtrack HiFi are emulating a 1-bit white noise channel using $d418 samples.
2016-11-10 00:18
Trash

Registered: Jan 2002
Posts: 118
This might fit the list: M.B.S Sampling
2016-11-11 07:06
Inge

Registered: Nov 2003
Posts: 136
Quote: Quoting Hein
GBK-Test by ATOO


In which form was it released? Anyone got the respective executable?


I've uploaded an executable.

The program actually takes 64 bytes from selected parts of the ROMs and make decent samples out of it in real-time. AFAIR, GBK relates to some algorithm, but I haven't been able to find any references.

EDIT: It's here: GBK-Test
2016-11-11 07:41
Mixer

Registered: Apr 2008
Posts: 311
Quote: I've uploaded an executable.

The program actually takes 64 bytes from selected parts of the ROMs and make decent samples out of it in real-time. AFAIR, GBK relates to some algorithm, but I haven't been able to find any references.

EDIT: It's here: GBK-Test


The GBK algorithm is mentioned in the Heins sid-link comments. It is simplified Karplus or Karplus-Strong as well.

There is a lot of unexplored potential with Karplus and digital waveguide synthesis in c-64.
2019-08-14 18:23
aeeben

Registered: May 2002
Posts: 24
BTW. I've somehow missed this one - How did SounDemoN's autochords work? Flipping pulse phase in timer interrupt(s) to create the 2nd and 3rd voice? I guess it only works with pulse wave then?
2019-08-15 10:43
Mixer

Registered: Apr 2008
Posts: 311
The test bit chord thing, which Soundemon used in autochord was actually something I came up with, but he made something useful out of it.

Note frequency values or SID FRQ register values are converted to CIA timer periods. 4 timers = 4 notes in chord.

When any timer is 0, the irq is triggered, and one can then toggle the test bit on/off in an interrupt handler. Or one can poll the irq registers in busy loop / unrolled code and toggle test bit on/off accordingly.

This causes a train of waveform resets, which to ear sound like a chord.

Pulse, Triangle and Saw all work, but sound awful initially. Filtering the voice makes the chord sound nicer.

Same effect can be done using just one timer, by simulating the train of reset events, by changing the irq timer period on every irq. Calculating the timer sequence takes some raster lines per frame, but it is proven to work.
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