Plectrum is a classic emulation of plucked string instruments. It is impossible not to fall in love with its deep and complex sonority. Plectrum supports USB and Bluetooth MIDI devices and works both as a standalone application, and as an Audio Unit plugin for GarageBand and many other hosts.
Version 2.1 includes the ability to load sound files from Plectrum's folder on iCloud.
Ratings and Reviews
Nice AU Pluck Sounds
This app can generate nice plucked sounds. It's a good source for combining with various effects with very low CPU usage.
Minimal is an understatement
Just three parameters and none of them are ADSR. Also, the tremolo effect seems to start on its own regardless of not having any depth or speed.
I'm not the kind of person that rates things highly just because they're free.
With Family Sharing set up, up to six family members can use this app.