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1
2
3
VCO 1
0 1
6
1
5
7 8
2
2
4
3
3
3
9
NOISE
4
4
2
10
5
1
5
11
6
0
12
6
-
+
TUNE
PW
VCO 2
6
0 1
5
7 8
1
4
2
2
3
9
3
3
2
10
4
4
1
11
5
5
SYNC
SLIDE
0
12
6
6
-
+
TUNE
4
5
6
7
1.2
Front Panel Controls
VCO 1:
1.
TUNE: Regulates the pitch of the VCO 1
2.
PW: Pulse width of the rectangular pulse
3.
Changeover between the signal types saw tooth, noise and rectangle
4.
SLIDE: regulates the time balance of VCO 1 and VCO 2
VCO 2:
5.
TUNE: Regulates the pitch of the VCO 2
6.
SYNC: Synchronises VCO 2 with VCO 1
7.
Changeover between the signal types saw tooth, external (input on rear of housing) and rectangle
Mixer:
8.
VOL VCO 1: Volume of VCO 1
9.
RINGMOD: Volume of the ring modulation of VCO1 and VCO2
10. VOL VCO 2: Volume of VCO 2
VCF:
11. CUTOFF: Cut-off frequency of the filter
12. RESONANCE: increases the harmonics at the cut-off point
13. Changeover between lowpass and highpass
14. ACCENT: Pulsed increase of the cut-off frequency and the volume
15. ACCENT ON Indicator: Lights when the accent function is switched on (MIDI Controller 65)
16. Determines the edge steepness of the filter: 12 or 24dB / octave
17. KEYFOLLOW: The cut-off frequency is influenced by the actual note
LFO:
18. RANGE: Changeover between three LFO frequency ranges
19. FREQUENCY: Setting the LFO frequency
20. LFO Indicator: Indicates each positive half wave of the LFO.
Note: The eye recognises frequencies larger than 60 Hz as being static.
21. Changeover between symmetrical and asymmetrical LFO waveforms
22. Selector switch for different LFO waveforms. By means of the matrix presentation, there are a total of 9
signal forms available: sinus, asymmetrical sinus, triangle, saw tooth, rectangle, pulse, random, noise and
external (input on the rear of the housing)
23. MODULATION: Determines the strength of the LFO influence
24. LFO ON..: LFO assignment possibilities: VCO 1, VCO 2, PW 1, cut-off, pan (any combination possible)
Envelope:
25. ATTACK: Rise time
26. DECAY: Decay time
27. SUSTAIN: Hold level
28. RELEASE: Release time
29. ENV MOD: Influences the cut-off frequency with the envelope
Stereo VCA:
30. GROUNDLEVEL: Ground level of the unit. This also includes the volume increase influenced by the
accent.
31. PAN: Regulates the relationship of the volume from the left and right-hand channel
Various:
32. LEARN Key; Switches the ProTone to the learn mode
33. GATE / LEARN indicator
34. Switch-on indicator
35. Main switch
Service Manual ProTone
8
9
11
12
FILTER
6
5
7 8
4
9
3
2
10
6
6
HIGHPASS
5
7 8
5
7 8
4
4
1
11
3
9
3
9
0
12
VOL VCO 1
2
10
2
10
1
11
1
11
LOWPASS
0
12
0
12
6
5
7 8
CUTOFF
RESONANZ
4
3
9
2
10
1
11
0
12
RINGMOD
12 dB
6
5
7 8
FOLLOW
4
6
5
7 8
3
9
EXT
4
2
10
3
9
1
11
2
10
24 dB
0
12
1
ON
11
ACCENT
0
12
VOL VCO 2
10
14
15
16
Page 4 of 20
13
18
19
20
21
22
ProTone
SPECTRAL AUDIO
LFO
RANDOM
NOISE
6
MIDDLE
5
7 8
4
EXT.
9
3
HIGH
2
10
1
11
LOW
0
12
WAVE
FREQUENCY
RANGE
KEY-
6
6
6
5
7 8
5
7 8
5
7 8
4
4
4
9
9
9
3
3
3
2
10
2
10
2
10
1
11
1
11
1
11
0
0
0
12
12
12
ATTACK
DECAY
SUSTAIN
17
25
26
27
23
24
30
33 34
MIDI ANALOG SYNTHESIZER
VCO 1
CUT
-
OFF
6
5
7 8
VCO 2
4
6
5
7 8
9
4
3
PAN
3
9
2
10
PW 1
2
10
1
11
1
11
0
12
LFO ON ...
0
12
MODULATION
GROUND-
LEVEL
6
6
C 1
1
5
7 8
5
7 8
4
4
2
2
9
9
3
3
3
3
2
10
2
10
4
4
1
11
1
11
5
5
0
0
12
12
L
R
RELEASE
ENV MOD
PAN
28
29
31
32
© 1996-2001 Spectral Audio
35
1
0
POWER
GATE /
LEARN
LEARN
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