Reface DX analysis
To understand the behavior of the reface DX vs DX7 (for example) I decided to make some measurements.
First a table to set modulator amplitude vs DX7 and Reface DX, then some LFO timing:
Then I decided to measure EG rates ... this is at this step that I got some surprises :
INIT VOICE
Algo : 12
OP 1: ON
Level: 127, Fixed frequency 9772 Hz
EG Levels: 127 0 0 0
EG Rates: 127 127 127 0 (very sharp attack and nothing else to get the NOTE ON event)
OP 2: ON
Level: 127, Fixed frequency 9772 Hz
EG Levels: 2 1 127 0
EG Rates: 127 89 127 127 (start of sound delayed with low levels L1 > L2, duration is set by R2)
OP 3: OFF
OP 4: OFF
Audio captured from OUTPUT/MONO with a Tascam DR-05X at 48 kHz.
Output level at Max.
Measurements done with Waveforms from DIGILENT (personnal use)
Note played C5 : the following pictures shows 3 measurements :
To conclude :
It seems that the sync on KEY ON is rather strange, even the OP1 blip is not always the same duration.
The delay induced on OP2 is fluctuating a lot (260 - 380 ms).
Same measurements done with Dexed or Chipsynth OPS7 gives no variation at all between measurement ...
To give some hints, here are the resulst of other measurements:
Perhaps this a choice Yamaha made to give the Reface DX some 'analog variations' to avoid a too much numeric synth ???