User Manual Viper Musical Instrument Amplifier Mf-105B [18/29 Pages]

Viper musical instrument amplifier MF-105B

The pedal cable should be shielded, with the shield connected to

the sleeve terminal. See Figure 14.

When connecting one or more pedal control input jacks to a

source of external control voltage such as an analog synth or a

MIDI-to-CV converter, you should use patch cords with tip-ring-

sleeve phone plugs. The ring terminal on the plug should not be

connected to anything, so that the MF-105B’s source of +5 volts

Figure 14 – Correct wiring for an expression

pedal

An expression pedal for

use with the MF-105B

should contain a 50KW

or 100KW potentiometer

which is connected from the

sleeve to the ring terminals.

The potentiometer wiper is

connected to the tip terminal.

Figure 15 – Correct wiring for a TRS CV

patch

is not shorted out. Or, if you do

not plan to use any expression

pedals with your MF-105B

but would like to apply control

voltages to one or more pedal

control inputs, you can use

patch cords with regular two-

conductor phone plugs. These

will short out the +5 volt supply to the ring contacts. This voltage

is current-limited, so you won’t burn anything out, - but no pedal

will work in any of the pedal control jacks if a tip-sleeve plug is

plugged into even one of the pedal jacks.

Applying a varying voltage to the tip terminal of a pedal control

input jack has the same effect as turning the corresponding knob. A

voltage change of about 5 volts at the tip terminal is equivalent to

turning the corresponding knob through its entire range. You can

‘program’ your MF-105B performance parameters entirely from

external control voltages, by turning the ENVELOPE, MIX, and

RATE control knobs to 5, and feeding 0 to +5 Volt programming

voltages to the tips of the pedal control input jacks. The LFO/

SWEEP jack can also receive 0 to +5 Volt programming voltages.