I just responded to @RandLaneFly regarding quantising a step sequencer which I realised wasn't an arpeggiator, but similar, discrete notes added to a looping sequence as opposed to chords played out with each note quantised.
Anyway I been going to upload this for a while but its still not finished (no presets yet) and the sync stuff is a bit iffy
Its a lot of fun to mess around with, get two or three going at once, use the Sync Start (with Midi In On to get them synced),
The Synth is simple but the effects help a lot
The Arp Duration affects things quite a bit
It also turned into a bit of a widget exercise.
There are two sub-patches displayed, the top is the arp and the bottom the synth