I probably have nearly every format of audio recording, though not the equipment to play them all.
I may be missing some, but I have-
Shellac 78 rpm records (no wax cylinders, the 78's are the oldest format I have)
no wire recordings
reel to reel 1/2and 1/4 track, 1/4' tapes (and equipment)
R2R 1/2" 8 track
33 1/3 vinyl, 45 rpm vinyl
dictaphone belts
8 track tapes
cassette tapes - including virgin C20 chrome bulk loaded
somewhere I think I have a master on betamax pro using a
dbx Model 700 encoder (much different from current pcm formats)Adat tapes
missing mini discs
Compact Discs (duhh)
now, the cloud :)
What formats have I missed ?