Howdy, Dimitris-
I am neckdeep in a Frankensteinian DM Dock edrum project right now. The project overview, with photos ?my first attempt to post yesterday failed? should be posted over on the Lobby/Sight & Sound subforum shortly; however, regarding usability,
the short answer is absolutely yes, there are a few usable apps for iOS/iPadOS, but they are hit and miss...pun intended. I installed and uninstalled several freebies straightaway. I kept a few I have not tried yet, e.g. Barbax and Korg Gadget, but have not tried them out.
I briefly tested, then immediately bought Digistix2. It worked immediately in basic function, and saved for later while I test it, this weekend, with a few serious Windows 10 libraries and hosts.
EDIT: My apologies, Jim!
BFD Free worked straightaway. Testing continues.