Audio Mixer 3.2
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Above: screenshots from two of the included examples (version 3.1)
Audio mixer 3.2 is a completely reworked version of the audio mixer featured in the Amiga Tech Audio Mixing example. This version has a completely reworked API, much more detailed documentation, extra examples, integration with C programs and several new features.

Note: see here for the Amiga Tech audio mixing example.

  • Up to four samples can be mixed onto a single hardware channel.
  • High performance: mixing four samples onto a single channel at 11KHz takes only 3.7% CPU time on a 7MHz 68000 without Fast RAM.
  • Can be run while a music playback routine is running, as long as the music routine does not access the hardware channel(s) used by the Audio Mixer.
  • Up to four hardware channels can be assigned to the Audio Mixer, allowing up to 16 samples being played back at the same time.
  • Sample playback is priority based, so that drowning out of important effects can be prevented.
  • Samples can be stored anywhere in RAM, including in Fast RAM and Slow RAM.
  • Samples can be set to loop and both looping/non-looping samples can be stopped on request
  • Samples can be assigned to one of the virtual channels the mixer uses (up to 4 per hardware channel), allowing fine-grained control of SFX playback.
  • Supports playback of samples of any size that will fit in RAM*.
  • Sample rate used can be configured at assembly time, using standard Paula period values.
  • Fully PC relative code is used to make relocation as easy as possible.

*) in practice, this is limited by the largest maximum single block of free RAM that exists. A system with multiple memory expansions will be limited to a much smaller maximum sample size than the total RAM size would seem to indicate.

Download the Audio Mixer 3.2
Full documentation for the Audio Mixer 3.2