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Echoplex Multiply Function and Building an Elegant Blues



I've just discovered something interesting on the Echoplex that I want to
share with the other EDP users on this list.  This has to do with the
multiply function.  What I've discovered is that I can end the multiply
function by hitting insert and then immediately return to the multiply
function to generate a blues progression rather elegantly.  However, some 
of
the subsequent behavior is puzzling me, so I want to give this specific
example.  FYI, I have quantize on.
The song I am constructing is a blues.  I play a figure for the first
phrase, the "I" chord, which is one bar in length.  I allow it to play one
additional time (now playing bar 2).  I hit multiply, and the "song" 
begins.
After the fourth cycle begins and bar 4 of the "song" is playing, I hit
insert and when bar 5 begins, I am in insert mode and I play the "IV" chord
for two bars.  Around bar 6 or so I hit multiply again and when bar 7
arrives, I am treated to two bars of "I", as created by the original
multiply.  I allow this to continue through bar 8--I press insert during 
bar
8, and when bar 9 arrives, I play the "V" chord for two bars, pressing
multiply during bar 10.  When bar 10 arrives, it again delivers two bars of
"I", and during bar 12 I hit either multiply or record.  This completes the
"song" in 12 bars.  This is what I discovered.
Now to the part I don't fully understand.  Let's alter the chord
progression.  We start with the same figure for the first phrase, the "I"
chord, which is one bar in length.  I allow it to play one additional time
(now playing bar 2).  I hit multiply, and the "song" begins.  After the
second cycle begins and bar 2 of the "song" is playing, I hit insert and
when bar 3 begins, I am in insert mode and I play the "IV" chord for two
bars.  Around bar 4 or so I hit multiply again and when bar 5 arrives, I am
treated to two bars of "I", as created by the original multiply.  During 
bar
6, I hit insert and play the "V" chord for two bars (bars 7 and 8).  During
bar 8 I hit multiply.  When bar 9 arrives, I expect two bars of the "I"
chord.  Instead I am jarred by one bar of "I" and one bar of "IV".  What
gives?  Or to put it more clearly--with which cycle does the multiply 
begin?
BTW the second progression corresponds to the harmonic progression for 
"Boil
That Cabbage Down" or it would if I could get that far  :=(
Gary