Version 3.6.0

Features

    - Sidebar browser for presets and samples
    - Oscillator distortion effect
    - Add 6 distortion types for distortion effect: hard clip, tan, atan, exp, log, polyomial
    - Bézier curve for envelopes
    - Add UI scale setting in "Settings" tab
    - Add midi key numbers in midi key popup
    - Edit instrument name in the TopBar
    - Add instrument midi channel and note off constrols to TopBar

Improvements

    - Increase FM modulation coefficient
    - Add gain to oscillator and instrument amplitude control
    - Use a single preset format (now all presets are *.gkit)
    - Setting as popup instead of tab widget
    - Some improvements to UI (icons etc.)

Fixes

    - Fix "force midi channel" checkbox for settings