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Looper's Delight
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Kim, this message is directed at you but I'm posting it to the list since
others may find it interesting.
I don't understand enough about how the EDP generates and uses MIDI sync.
I've read the EDP manual several times, the FAQ on the Looper's Delight
website, and other MIDI books like "MIDI for the Professional." (Pages 3
and 7 on the FAQ are quite well done, BTW.)
Some basic questions I have are:
1) What determines the MIDI clock rate sent by the EDP?
2) How does the 8ths/beat and loop or cycle length affect the clock rate?
3) The manual implies 8ths/beat really means 8ths/cycle, I think. Please
clarify.
4) How do multiple cycles per loop affect MIDI syncing?
Lots of examples will help.
I use two EDPs. One is the master and generates the MIDI clock. The other
is the slave. I tried some things this past weekend which confused me.
Here is a description. Can you explain what is happening?
basic setup:
MASTER EDP SLAVE EDP
------------------- -----------------
SYNC out in
8ths/beat 1 1
SwitchQuant cyc cyc
MIDI out<---------->MIDI in
Notes:
a) SYSTEM RESET below means long press on REC of both MASTER and SLAVE
followed by long press on MUL of both MASTER and SLAVE
b) both EDP have latest software and are fully populated with memory
scenario 1
-------------
1) SYSTEM RESET
2) Make a loop approx 10 sec on SLAVE (REC, wait 10 sec, REC)
3) As expected, the StartPoint decimal point flashed at start of loop; also
the Sync decimal point doesn't flash since the SLAVE isn't synced to the
MASTER.
4) Also as expected, pressing NextLoop soon after the StartPoint flashes
will switch to Loop2 at the end of the first loop.
scenario 2
--------------
1) SYSTEM RESET
2) Make a loop approx 10 sec on MASTER (REC, wait 10 sec, REC)
3) Sync decimal point on the SLAVE flashes 12 times for each time the
StartPoint decimal point flashes on the MASTER.
4) Record a loop approx 10 sec on SLAVE (REC, wait 10 sec REC)
5) Pressing NextLoop on SLAVE causes the SLAVE to go to loop 2 before the
end of the cycle. It seems to go to loop 2 when the next SyncPoint occurs.
Unexpected results/I'm dazed and confused
---------------------------------------------------------
1) When synced to MIDI clock, the slave doesn't seems to pay attention to
the SwitchQuant setting of 'Cyc' (but see 3 and 4 below).
2) I expect the SLAVE to record only cycles which are in multiples of the
MASTER's cycle time. It does not in scenario 2 above (but see 3 and 4
below).
3) The SLAVE does record only cycles which are in multiples of the MASTER's
cycle time if 8ths/beat of the SLAVE = 8ths/beat of the MASTER and not 1
(i.e., 8ths/beat = 2, 3, ..., 20)
4) Also, if 8ths/beat of MASTER and SLAVE is set to 1, the slave does
record
only cycles which are in multiples of the MASTER's cycle time for short
cycles. If the MASTER cycle time if < 5.5 seconds then the SLAVE records
multiples. If the MASTER cycle time is >= 5.6 seconds then the slave
records non-multiples.
Dennis Leas
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dennis@mdbs.com