It sits in the session where the song is happening.

Add Songling to an instrument track and it follows your DAW's transport and key. When a progression is right, drag it straight onto a track as MIDI — or export MIDI and MusicXML and keep working wherever you like.

• Audio Unit — Logic Pro, GarageBand, and any other AU host on a Mac.
• VST3 — Cubase, Ableton Live, Reaper, Studio One, Bitwig, FL Studio, on both platforms.
• On its own — the same app, standalone, when there's no session yet.

The sounds and screens install once and are shared by all three, so your disk carries one copy, not three.