the PlaySNG experiment

PlaySNG is a SID-DUMP file player and a test suite for synder since 4 years

Keys:
        A,D: set cosine additive synthesis for Waveforms
        S,F: set sine additive synthesis for Waveforms
        Q,W: clear waveform
        E,R: random waveform
          T: switch source and dest waveform
        1-8: increase (with shift: decrease) harmonics of currently selected waveform
    <SPACE>: select edit waveform
      <TAB>: switch between pattern scroll and waveform display
<BACKSPACE>: switch between linear and triangular pulsewidth
      I,O,P: mute/unmute channel 1,2,3
      X,C,V: predef waveforms

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