CARL 1.1 is NOW out!

User Guide | Sample clips and songs

Merchandise at Zazzle

CARL is a complete retro analog synthesizer sequencer app!

Check out some of the amazing features above:


A complete sequencer!

  • Unlimited tracks
  • Piano roll editor for sequences
  • Copy / Paste / Duplicate
  • Tempo
  • Quantization controls
  • Track mute / solo

Screen Shot 2016-04-17 at 4.57.44 PM

Piano roll editor

  • Tracker editor!
  • Old school style tracker note entry and editing
  • Flexible resolution, non-destructive on-the-fly changes
  • Compatible with the sequence editor – auto-sync views
  • Arpeggio support without having to use 0xx effects

Screen Shot 2016-04-17 at 4.56.49 PMTracker editor

A complete analog-style synthesizer!carlsynth

  • Sin / Tri / Sqr / Saw / Noise / SPS* waveforms
  • Attack / Release
    Polyphony / Monophonic arp wavetable
  • Unison / Drum / FM modes
  • Three routing options (add / mult / mult+add)
  • Parametric vibrato
  • Balance / Volume controls
  • Preset save / load / export / import

* SPS, Starfield Parallax Synthesizer, is a sound produced by a shifting waveform that’s generated by a moving parallax star field.

…and more!

  • Input / output support!
  • MIDI live play / record
  • Keyboard play / record
  • Export song to .wav

Go to the product home page


Any questions, bug reports, etc can be posted below as comments.

9 Responses

  1. Romain says:

    Hi, I just bought your app on mac app store and when I whant to use it with my midi controller it doesn’t work. Every note I play still playng untill I use “play” or “stop”. It’s like if the sustain pedal was always open. But I don’t have any sustain pedal.

    • simo says:


      Sorry to hear there are problems with the MIDI processing. To figure out what is going wrong, can you download the following app:

      Uncompress it and run the included .app – then, choose your MIDI input from the Preferences window. Now, you can play some notes, first separately, then a few at the same time, and copy the output from the text window and send by email (I sent you the address to yours).

      Also, if you can include the make and model of your keyboard, that’ll help as well.

      Meanwhile, I know it’s not the same, but the keyboard keys ZSXDCVGBHNJM play a lower octave and Q2W3ER5T6Y7U an upper octave. That way you’ll get started and the keys should at least not stick down like that.

      Again, sorry for the inconvenience.

    • simo says:

      This problem has most probably been fixed in CARL 1.0.2 – some MIDI controllers don’t send a MIDI Note Off message, instead they just send a new Note On event with a zero volume. CARL 1.0.2 now handles this as a Note Off event.

      Sorry for the inconvenience, let me know if there are other problems or if 1.0.2 doesn’t fix this for you.

  2. Pingback: CARL 1.1 is out! | Mostly undocumented stuff

  3. Pingback: CARL 1.1 is out! « Gfxile – Graphicsile

    • simo says:

      Thank you for your interest in CARL! I’m sorry but at the moment the App Store is the only source.
      If there is more interest in an alternate scheme, maybe some day, but right now there’s no other option. Sorry.

  4. markus toivonen says:

    where can I get it? there is no download link or shop page or anything? does it even exist? Why cant you put link to this page? ‘Go to Product page’ only takes me to this page.

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