Sorry for a reely dumm question,...
How many heads on the 22-2?
If it's 3 heads, you'd expect the typical "Sync/Repro" selector switches, which the 22-2 obviously does not have.
If it's a 2 head deck, then Monitor: Source/Tape could still indicate sync/overdubbing capability.
Inquiring minds want to know!!
[EDIT]
I saw a photo of the "specs" page in the 22-2 manual, and it says:
Head Configuration: 3 heads: Erase, Record & Reproduce.
Still no sync, eh?
Mixmkr & I discussed this several times at length, and I must admit, I still don't get it. What's the point of having 3-heads with independend Record Function and Monitor Select, if not for sync/overdubbing?
In my opinion, the 22-2 may be a handy and great sounding deck, but these features were not fully thought out!!
[/EDIT]