Glitchdesk Bend Workstation: Version 2 Operation

Patchbay

Each of the 50 blue and grey banana sockets correspond to a pin on one of the back panel DB-25 ports. Each banana socket is labeled by port (A or B) and pin number. These sockets can be patched to each other, the MIDI controlled rheostat, the phone jacks, or the MIDI controlled patch circuits.

The MIDI controlled patch circuits act as regular SPST normally open switches. The patch circuits activate in response to MIDI events. Each circuit has a corresponding LED that indicates when the circuit is active.

MIDI Response

MIDI Channel Selection

To change the MIDI channel, press and hold the Test Button during power-up. Press the Program Button to increment the channel. The channel setting is represented as a binary number. To read the channel, sum the numbers above the illuminated Program LEDs. When the channel is set to 16, all Program LEDs are off. When the desired channel setting is displayed, release the Test Button to enter normal operation.

The MIDI channel setting is retained when the Bend Workstation is switched off and when the battery is removed. The channel setting applies to each of the three MIDI Modes.

Note that MIDI Clock messages are channel-independent. In MIDI Mode 2, the MIDI controlled patch circuits will continue to respond regardless of the channel setting, but Program Change commands must be sent on the appropriate channel in order to work.

MIDI Mode Selection

Use the three-position rocker switch to select the desired MIDI Mode. Each mode responds differently to incoming MIDI data. See the MIDI Implementation page for details.

MIDI Program Selection

Increment the current program by pressing the Program Button. The current program can also be selected by sending a MIDI "Program Change" command on the appropriate channel.

For MIDI Modes 0 & 2, the current program is displayed on the Program LEDs as a binary number. To read the current program, sum the numbers above the illuminated Program LEDs. When the current program is 0, all Program LEDs are off. Program selection is retained during power off.

For MIDI Mode 1, the current program is represented by the states of the MIDI controlled patch circuits.

MIDI Activity LED

The MIDI LED indicates the presence of incoming MIDI data, regardless of channel or message type.

Test Mode

Each of the individual MIDI controlled patch circuits can be tested manually. To enter Test Mode, press the Test Button. Patch circuit 0 will become active, and MIDI Channel LED 0 will blink to indicate Test Mode operation. In Test Mode, all incoming MIDI data is ignored. Press the Test Button repeatedly to test each of the patch circuits. Press the Reset Button to resume normal operation.

Internal Ground Bus

The Bend Workstation features an internal bus which connects the following:

• Pin 25 of each DB-25 connector (when corresponding rocker switch is engaged)
• Sleeve of each 1/4" phone jack
• Banana socket on back panel

Use the internal bus to ground target devices for cross-bending, or to ground the phone jacks for audio output.

The bus is isolated from the other circuitry inside the Bend Workstation.

Glitchdesk Bend Workstation: Version 1 Operation

Patchbay

Each of the 50 blue and grey banana sockets correspond to a pin on one of the back panel DB-25 ports. Each banana socket is labeled by port (A or B) and pin number. These sockets can be patched to each other, the MIDI controlled rheostat, the phone jacks, or the MIDI controlled patch circuits.

The MIDI controlled patch circuits act as regular SPST normally open switches. The patch circuits activate in response to MIDI events. Each circuit has a corresponding LED that indicates when the circuit is active.

MIDI Response

Use the three-position rocker switch to select the desired MIDI mode. Each mode responds differently to incoming MIDI data. See the MIDI Implementation page for details.

To change the MIDI channel, press the button below the MIDI channel indicator LEDs. The channel setting is represented as a binary number. To read the channel, sum the numbers above the illuminated LEDs. When the channel is set to 16, all LEDs are off.

The MIDI channel setting is retained when the Bend Workstation is switched off and when the battery is removed. The channel setting applies to each of the three MIDI modes.

Note that MIDI Clock messages are channel-independent. In MIDI Mode 2, the MIDI controlled patch circuits will continue to respond regardless of the channel setting, but Program Change commands must be sent on the appropriate channel in order to work.

MIDI Programs (for Mode 0 and 2 only) can be selected manually. With the power off, select the desired MIDI Mode. While holding down the Test Button, turn the power on and press the MIDI Channel Button until the desired program number is displayed. When the Test Button is released, normal operation begins.

Program selections (for Mode 0 and 2 only) are independent from each other. Each program selection is retained when the Bend Workstation is switched off and when the battery is removed.

The MIDI LED indicates the presence of incoming MIDI data, regardless of channel or message type.

Test Mode

Each of the individual MIDI controlled patch circuits can be tested manually. To enter Test Mode, press the Test Button. Patch circuit 0 will become active, and MIDI Channel LED 0 will blink to indicate Test Mode operation. In Test Mode, all incoming MIDI data is ignored. Press the Test Button repeatedly to test each of the patch circuits. Press the Reset Button to resume normal operation.

Internal Ground Bus

The Bend Workstation features an internal bus which connects the following:

• Pin 25 of each DB-25 connector (when corresponding rocker switch is engaged)
• Sleeve of each 1/4" phone jack
• Banana socket on back panel

Use the internal bus to ground target devices for cross-bending, or to ground the phone jacks for audio output.

The bus is isolated from the other circuitry inside the Bend Workstation. ---------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------