Reply To: What does it take to get ARP mode in Juno 66 fixed ?

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#8679
Anonymous
Inactive

Hello Tubbutec, and sorry it took me so long to respond. I didn’t have access to any other Roland than my modded Juno 66 up until today.

I was able to compare the Juno 66’s behavior with a JP8, and found what the exact bug is:

– Set ARP to Up/Down, 3 OCT
– Now, if you play a C-E-G chord on the bottom octave, on the 66 it will arpeggiate correctly
– But if you play the same chord in higher octaves, where the 66 cannot play all 16 notes (as it reaches the top note too soon), then it would repeat the highest note once it reaches it, instead of playing it only once and move on to the next note

This works correctly on the JP8, but doesn’t work correctly on the 66.

This wrong behavior makes the ARP play odd length patterns, such as 13 and 7 steps instead of 12 and 6 steps, which isn’t musical and cannot really be used in a musical way…

So:

Playing a CEG chord starting at C3 on the keyborad, it currently plays for each loop:
C3 E3 G3 C4 E4 G4 C5 C5 G4 E4 C4 G3 E3 (13 steps)
– It doesn’t repeat C3 when it goes back to it, but repeats C5 when it goes up to it.

It should be:
C3 E3 G3 C4 E4 G4 C5 G4 E4 C4 G3 E3 (12 steps)

The same way, if you play a CEG chord starting at C4, it currently plays for each loop:
C4 E4 G4 C5 C5 G4 E4 (7 steps)

When it should play:
C4 E4 G4 C5 G4 E4 (6 steps)

So basically it should not play the top note in the ARP sequence twice, before it falls back.

Note: This bug also happens in Up/Down, 2 OCT mode.

Would you please be able to fix this for us? the ARP is the heart of every Juno!