Hafler IRIS - Manual (Page 9)

Recording Any recording requires that you activate either the RECORD 1
System jacks, the RECORD 2 jacks (or both) using the RECORD 1 or
RECORD 2 switches on the panel.
As seen in the signal flow diagram, this makes any input
selectable by the KEYS available to these outputs.
EXAMPLE: KEY-selecting TUNERwith RECORD 1 depressed
will send both TUNER channels out the RECORD 1 jacks to the
INPUTS of the tape deck.
The diagram also shows that if you have two decks you can
select either as a PLAYER using the TAPE KEYS and send it
to the other deck for recording.
EXAMPLE: Select deck 1 as PLAYER with TAPE KEY 1 and
send to deck 2 through the RECORD 2 switch and jacks.
OR: Select deck 2 as PLAYER with TAPE KEY 2 and send to
deck 1 through the RECORD 1 switch and jacks.
CAUTION:
Engaging either RECORD switch on IRlS brings into action
special safety logic which you may easily interpret as faulty
operation, until you understand its put-pose:
1) IRIS refuses TAPE KEY 1 if RECORD 1 is engaged. Likewise
for TAPE KEY 2 and RECORD 2. These are potentially danger-
ous sources of unexpected high-energy positive feedback
loops, having been known to destroy more than a few loud-
speakers.
2) These switches automatically restrict certain remote control
actions, as explained later.
Thus always leave these switches OUT, unless actually re-
cording.