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I'm posting the results of some calibration measurements I've done on DIVA. Methodology is explained after the results. Any value of "--" means I couldn't get a good reading. Perhaps some of you will find this data of value.
Sorry about the poor alignment of the results. I'm using the code formatting option with no tabs, but the columns refuse to line up. Possibly cutting and pasting into an editor will make the results more readable.
Filter cutoff for the LPFs. Units are KHz. Values of settings below 60 or so have increasingly questionable accuracy.
Ladder Cascade Mlt-Md BITE
150 19.8 -- 20.0 19.8
145 17.7 19.0 17.5 17.7
140 13.3 13.3 13.2 13.2
135 9.89 9.89 9.89 9.97
130 7.43 7.43 7.51 7.43
125 5.59 5.59 5.59 5.59
120 4.20 4.20 4.20 4.20
115 3.15 3.12 3.15 3.15
110 2.35 2.37 2.37 2.37
105 1.78 1.76 1.76 1.76
100 1.33 1.33 1.33 1.31
95 .986 .986 .986 .986
90 .741 .741 .741 .733
85 .551 .551 .551 .568
80 .418 .414 .410 .410
75 .311 .311 .311 .305
70 .234 .236 .231 .231
65 .176 .178 .176 .174
60 .133 .135 .135 .133
55 .099 .101 .098 .098
50 .078 .077 .078 .075
45 .060 .060 .059 .058
40 .046 .047 .048 .045
35 .038 .038 .039 .036
30 .033 .033 .036 .032
Amplitude Envelope Attack. Units are seconds.
Analog Digital ADS
0 -- -- --
5 -- -- --
10 .008 .01 --
15 .02 .02 .006
20 .04 .03 .01
25 .09 .04 .02
30 .20 .07 .04
35 .43 .12 .07
40 .89 .19 .13
45 1.6 .30 .24
50 2.5 .48 .42
55 3.2 .78 .59
60 3.7 1.2 1.1
65 4.0 2.0 1.7
70 4.1 3.1 2.2
75 4.1 4.8 2.8
80 4.1 7.2 3.1
85 4.1 11 3.4
90 4.1 15 3.6
95 4.1 21 3.7
100 4.1 28 3.7
Amplitude Decay. Units are seconds. For the ADS decay, a sustain level is present and the actual delay routinely starts after holding at the max. level for a short period. For all three, I measured the decay from a max. sustain setting, recording the time when the signal completely disappeared. Practically speaking, the signal would be perceived to be over a little bit soon than the values shown below.
Analog Digital ADS
0 -- -- --
5 -- -- .02
10 .02 -- .04
15 .03 .01 .08
20 .06 .02 .16
25 .11 .05 .34
30 .21 .09 .71
35 .41 .20 1.4
40 .69 .43 2.9
45 1.5 .94 5.6
50 2.7 1.9 10
55 4.7 3.9 17
60 7.5 7.2 26
65 11 12 34
70 14 17 39
75 16 21 43
80 18 23 45
85 19 24 46
90 19 25 47
95 19 25 47
100 19 25 47
Amplitude Envelope Release. Units are seconds. Unlike decay, which seemed not to vary too much when using sustain values of zero and 50, release times seem to be a function of sustain level. Values below show release times from sustain settings of 100 and of 50.
---Analog-- --Digital--
100 50 100 50
0 -- -- -- --
5 .007 -- -- --
10 .01 .01 -- --
15 .03 .03 .008 .008
20 .05 .05 .02 .02
25 .11 .09 .04 .03
30 .20 .14 .09 .07
35 .41 .35 .20 .15
40 .79 .66 .44 .33
45 1.5 1.2 .94 .71
50 2.8 2.3 2.0 1.5
55 4.8 4.0 4.0 3.0
60 7.6 6.3 7.3 5.5
65 11 9.0 12 9.0
70 14 12 17 13
75 16 13 23 16
80 18 15 24 18
85 18 15 25 19
90 19 16 25 19
95 19 16 26 19
100 19 16 26 19
Methodology:
For the cutoff readings, the process was simple. I put an instance of Voxengo Span after the synth in Sonar. I set the resonance to maximum. Playing a cluster of notes low in the keyboard with an oscillator set to use a saw wave. The spike at the cutoff frequency was easy to spot until getting to the lower values below about 60 on the cutoff control.
The amplitude envelope readings were also done with Sonar. In this case I had a MIDI track with a single note at middle C. For attack and decay, this note lasted well beyond the longest time. I set the subject control froze the track. Looking at the resultant wave form with a time-line setting of time (as opposed to M.B.T) and using the Aim Assist tool, getting the readings was tedious but straightforward.
