sqsl Nashville is a MIDI controller/tool for exploring harmonies, modes, and chord progressions within heptatonic scales.

Scale Definition:

• Choose from five scale patterns
• Select one of seven modes (pattern rotation)
• Set the root note

Chord Shape/Voicing:

• Four editable chord shapes
• Voicing defined by degree intervals (not semitones intervals), with the option to shift voices one octave up or down

Play and Loop:

• Performance pads spanning four octaves
• Looper for recording and replaying pad interactions

Note: The looper records only pad interactions—scale settings and chord voicings are excluded—allowing users to create simple progressions and modify scales or chord shapes on the fly.

Additional Features:

• Adjustable loop playback rate
• Automatic loop evolution (per loop cycle)
• Ability to target multiple MIDI channels (in rotating or random order)
• Optional velocity randomization
• Optional note start/end delay (0–1s)

Other Notes:

• Settings and loops are saved automatically
• App runs in the background
• No preset system
• Only standalone (no AUv3 support)
• Does not produce any sound its own