mehmetcanbudak/teensy-quencer

my attemp to make a little sequencer using teensy audio library... work in progress!!!

teensyquencer

Experimental multi-channel sequencer for teensy

• each channel has a number of patterns. each pattern has its own length
• setting next pattern on a channel will take effect once current pattern on that channel is complete.
• Im using an akai apc40 controller to select patterns for channels - please fork and adapt to your own controller...
• comming soon - star this repo if you want to see these features
  • midi import and export
  • playing samples at different pitches
  • parameter, midi, audio recording and playback

dependencies

• Audio library
• variable playback rate for teensy audio library

code

• define multisequencer:

tempo tempo(120.0f);
multisequencer multisequencer(tempo);
midisequenceadapter adapter(multisequencer); // to read midi files into the a sequencer pattern

• add sequencer channel(s):

  sequencer *sequencer1 = multisequencer.newSequencer();
  sequencer *sequencer2 = multisequencer.newSequencer();

• add event callbacks:

  sequencer1->onevent = [] (sequencerevent *event) {
      switch(event->channel) {
        case 0: triggerAudioEvent(event, playSdRaw1, "KICK.WAV"); break;
        case 1: triggerAudioEvent(event, playSdRaw2, "SNARE.WAV"); break;      
        default: break;
      }
  };
  
  sequencer2->onevent = [] (sequencerevent *event) {
      switch(event->channel) {
        case 0: 
          if (event->isNoteStartEvent) {
            sine1.frequency( event->rate * 65.41);
            envelope1.noteOn();
          } else {
            envelope1.noteOff();
          }
        default: break;
      }
  };
  

• add pattern:

  //                        !               !               !               !      
  const char* pattern4x4 = "X...X...X...X...X...X...X...X...X...X...X...X...X...X...X...X..."; 
  const char* patternSnr = "....x.......x.......x.......x.......x.......x.......x.......x..."; 

  // sequencer1
  int pattern = sequencer1->addPattern(4); // empty pattern: 4 bars;
  
  pattern = sequencer1->addPattern(4); // kick solo 4 x 4: 4 bars
  readPattern(0, pattern, pattern4x4, sequencer); //kick

  pattern = sequencer1->addPattern(4); // kick solo 4 x 4 + snare: 4 bars;
  readPattern(0, pattern, pattern4x4, sequencer); //kick
  readPattern(1, pattern, patternSnr, sequencer); //snare
  
  // load 'snare.mid' smf into next pattern of sequencer1
  adapter.loadMidi("snare.mid");
  adapter.loadMidifileToNextChannelPattern(0, 0, 8);  // multisequencer channel number=0 (==sequencer1), midi track number=0, 8 bars long
  adapter.close();


  // sequencer2
  pattern = sequencer2->addPattern(4); // empty pattern: 4 bars;

  // load 'dredbass.mid' smf into next pattern of sequencer2
  adapter.loadMidi("dredbass.mid");
  adapter.loadMidifileToNextChannelPattern(1, 0, 128, 24); // multisequencer channel number=1 (==sequencer2), midi track number=0, 128 bars long, transpose 24 notes
  adapter.close();

compiling for teensy

You will need to add c++ std library to your compiler flags in boards.txt (Teensyduino/Java/hardware/teensy/avr/boards.txt)

• remove -nostdlib from teensy40.build.flags.common
• add -lstdc++ to teensy40.build.flags.cpp

teensy40.build.flags.common=-g -Wall -ffunction-sections -fdata-sections
teensy40.build.flags.cpp=-std=gnu++14 -fno-exceptions -fpermissive -fno-rtti -fno-threadsafe-statics -felide-constructors -Wno-error=narrowing -lstdc++