10
Getting Started
Marion Systems
Getting Started
Audio Hookup
There are two identical sets of two-channel outputs on the TVS-PRO:
• Bendbox – Headphone Output with level control
• Rear panel – Audio Out Left & Audio Out Right
Both sets of outputs are driven by the same discrete power amplifier – the headphone outputs have an output
impedance of about 50 ohms and the rear panel outputs have an output impedance of 1000 ohms. The head-
phone level control is active on the headphone output only.
Rear Panel Connections
1
2
3
4
5
6
8
7
TVS-PRO
TVS-PRO – Two Voice Polyphonic Synthesizer
Marion Systems Corporation
Moraga, California
Serial No.
Marion Systems Corporation
100 - 240 VAC 50 - 60 Hz 15 Watts
This devices complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this evice must accept any interference received
including interference that may cause undesired operation
OUT
THRU
MIDI
IN
RIGHT
AUDIO OUT
LEFT
A1
IN
EXT AUDIO
B1
IN
GATE
OUT
SEM A
CV
OUT
GATE
OUT
SEM B
CV
OUT
1. AC Power Connector
—
Accepts a standard, grounded IEC power cord. Operates over a range of 100-240
VAC, 50-60 Hz, 15 watts.
2. MIDI In, Out, and Thru—
Standard 5-pin MIDI DIN connectors.
3. Audio Outputs—
Unbalanced, ¼ inch audio outputs. The output of each SEM can be panned individually
within the stereo field.
4. External Audio In—
Unbalanced, ¼ inch audio inputs. The Two-Voice Pro accepts external audio signals for
processing through these connectors. Input A
1
in is routed to SEM A. Input B
1
in is routed to SEM B. Input level
can be adjusted using the
ExT
knob in the VCF section of the SEMs.
5. SEM A Control Voltage Out—
Standard, ¼ inch TS connector. This jack outputs a 1-volt-per-octave signal for
interfacing with modular synthesizers and other gear that recognizes this standard.
6. SEM A Gate Out—
Standard, ¼
inch TS connector. This jack outputs a signal for triggering external sequenc-
ers and other devices that support this type of connectivity.
7. SEM B Control Voltage Out—
Standard, ¼ inch TS connector. This jack outputs a 1-volt-per-octave signal for
interfacing with modular synthesizers and other gear that recognizes this standard.
8. SEM B Gate Out—
Standard, ¼
inch TS connector. This jack outputs a outputs a signal for triggering external
sequencers and other devices that support this type of connectivity.
The conversion of incoming MIDI messages to pitch control voltages and gates is a basic requirement for control
voltage based synthesizers, and this operation is performed in the keyboard/sequencer module of the TVS-PRO
to a high level of pitch accuracy. The resulting pitch control voltages and gates are routed to the SEMs and are
also available on the TVS-PRO rear panel, and can be used to control external voltage controlled equipment.