I got a little sick of dogfooding this as-is and added some improvements: here's
vio2play for Linux release 3.
It now behaves roughly like the command-line versions of M1. You can give it multiple 2sf files on the command line (e.g. vio2play *.mini2sf) and use the * and / keys on the keypad to go forward and backwards through the invisible playlist. It also shows the tag info for each song as you bring it up. And you can press Esc or Q to quit cleanly.