As far as I know, there is no exhaustive list of all the A4 patches available for download and I am sure we will all be itching to fill up our +drives when OS 1.1 lands.
I thought I would kick off a list here. Please feel free to add any that I haven’t found yet.
Daren Ager’s ’ Druma’ bank - £7.00
Neil Baldwin’s ‘C64’ bank - free/donation
FISound’s ‘OVRDrive’ bank - $9.99
Elektron’s 'Sound Pack’ (Six banks, including Richard Devine’s collection) - free
Floppy Disk Pirates - Two sound banks - €9.99 each - and occasional free patch giveaways. Look out for Janosch’s posts on here.