1. Install portaudio:

    $ wget http://www.portaudio.com/archives/pa_stable_v190600_20161030.tgz
    $ tar -xvzf pa_stable_v190600_20161030.tgz
    $ cd portaudio
    $ ./configure --disable-mac-universal
    $ make
    $ sudo make install
   

2. Build it:

    make
   

3. Put on headphones, use a directional mic, or otherwise avoid letting the output of this program mix with the input.

4. Run it and whistle:

    make run
   

It will make a virtual MIDI source (whistle-pitch), which you can then pipe into a synthesizer.

There's also a version with its own built-in bass synthesizer, which is a plgg-in version for a DAW (like Reaper):

• source: https://github.com/jeffkaufman/iPlug2

• mac vst: https://www.jefftk.com/BassWhistleVST3-v1.zip

• Works best with a directional microphone with a windscreen (vocal mics like the E835 or SM58 have one built in).

• I use a Sennheiser E835 with an xlr to 3.5mm adapter into a USB C headphone + microphone adapter. This isn't how the microphone is designed to be used (it wants a pre-amp) but it works well enough and it's nice not to have another piece of hardware.

• You want to be as close to the microphone as you can bear.

• Depending on your microphone you will probably need to tweak MIN_ENERGY to find the right threshold to trigger at. If it's failing to detect your whistle, set it to a lower number. If it's triggering on noise, set it to a higher one. If there's no zone where it reliably triggers on whistling and reliably doesn't trigger on noise then improve your microphone, your microphone technique, or your whistling technique.

1. Build liblo

   cd liblo-0.30/
   ./configure
   make
   sudo make install
   

2. Run: make run-osc