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Tuning the VCOs
Marion Systems
Tuning the VCOs
To tune the four VCOs on the two SEMs:
1. In the ASSIGNMENTS section, select “KEYB” for both SEMs.
2. On the Bendbox set the VCO2 DETUNE pot to zero.
3. Press and hold the “VELO CURVE” button until it changes to “on” and press the high A natural key.
4. Set all VCF Mixer pots to the off (“12 o’clock”) position.
5. Activate the A-440 tone by turning on the SEM A VCF EXT #1 pot all the way to the left.
6. Turn on one VCO mixer pot, tune the VCO & turn off that pot.
7. Repeat for all four VCOs.
8. Turn off the A-440 tone by turning on the SEM A VCF EXT #1 pot to the off (“12 o’clock”) position.
9. Press the “VELO CURVE” button again. The TVS-PRO returns to normal playback mode.
Keyboard Electronics
• MIDI CHAN – allows selection of the MIDI Channel from 1 to 7
• VELO CURVE – allows selection of one of eight velocity curves. V
elocity curve “0” is full velocity.
• BEND RANGE – allows selection of the range covered by the pitch wheel from 0 thru 12 semitones
Keyboard Modes
Creating a “polyphonic” synthesizer with only two voices is difficult because of the limitations of how notes
played on the keyboard can be assigned to voices. To make the operation of the TVS keyboard as flexible as
possible, several modes are implemented.
The TVS-PRO keyboard works in three modes:
• Unison
• Split
• Polyphonic
The Unison mode and the Split mode are very similar. In Unison mode the various possibilities of how notes
played on the keyboard affect the functioning of the SEMs applies over the complete keyboard. In Split mode
the same rules apply — except that notes played below the split point affect SEM A and notes played at and
above the split point affect SEM B.
There are four sub-modes within the Unison or Split modes:
• Unison/Split “Legato”
• Unison/Split “Retrigger”
• Unison/Split “Play on Release, Legato”
• Unison/Split “Play on Release, Retrigger”
