MIDI Control for Electro Harmonix Cathedral Stereo Reverb
The Cathedral Stereo Reverb from Electro Harmonix is an excellent reverb guitar effect with infinite reverb („freeze“) and tap tempo function. Unfortunately, it has not got any MIDI control.
Using our electronic kit it is possible to control the Cathedral by Program Change or Control Change MIDI command. The principle of operation is that the built-in MIDI controller electronically simulates turning and pressing the white control knob (encoder) and replaces an activity which would have to be carried out during the guitar playing. Instead, just by pressing a button on a MIDI footswitch controller, the Cathedral is automatically set to the preset corresponding to the number of Program Change/Control Change (1-8) or set to a sound corresponding to the momentary parameters of the black control knobs without preset (Program Change 9 or more or Control Change value 0 or 9 or more).
This small electronic kit facilitates controlling the Cathedral using a foot MIDI controller or from a computer by DAW software. The module doesn't affect neither the original sound nor functionality. It works in parallel with the knob. Moreover, if you move the knob, the mod isn't lost and after receiving appropriate MIDI message it sets correct program regardless of the previously set program.
How it works
Setting receiving MIDI channel
1) DIP switches
According to required MIDI channel, set the DIP switches this way:
2) Software configuration
The MIDI channel and all other parameters can be changed even using MIDIConfig web-based configuration tool.
- Setting the MIDI channel using the DIP switches is active only if the MIDI channel is not set by software configuration.
- The software configuration has higher priority than the DIP switches.
- When the MIDI channel is set to default 1 by software configuration, the MIDI channel is read from these DIP switches.
- When the MIDI channel is set to higher number by software configuration, the status of DIP switches has no effect.
Default MIDI control commands
| Command | Number | Value | Function | Note |
|---|---|---|---|---|
| Program Change | 1 - 8 | --- | Set program 1 - 8 | Can be reconfigured to Control Change |
| Program Change | 9 - 128 | --- | Set program off - the effect corresponds to the positions of the buttons | |
| Control Change | 96 | 64 - 127 | Program increment | |
| Control Change | 97 | 64 - 127 | Program decrement | |
| Control Change | 21, 22, 23 | See the next table |
Tap Control Changes
There are three options for controlling the Tap/Freeze function by Control Change (CC) MIDI messages:
| Default CC number | Function | Values |
|---|---|---|
| CC#21 | Momentary |
64 - 127: Press Suitable for full control of both Tap tempo and Freeze function by a computer or by any MIDI controller that can send CC commands. |
| CC#22 | Pulse |
Any value (0 - 127): Press immediately Suitable for controlling Tap tempo by a computer or by any MIDI footswitch controller that can send CC commands. |
| CC#23 | Toggle |
Any value (0 - 127): Toggle the state of the switch: first CC carries out pressing, second CC carries out releasing of the footswitch. And so on: press, release ... Suitable for controlling Freeze function by any MIDI footswitch controller that can send CC commands. |
The CC numbers can be reconfigured from default values to any other numbers (0 - 127).
Variants and prices
We offer this module as a standard product with short delivery times in different variants:
| Variant | Price |
|---|---|
| MIDI module for build into the effect | 65.00 USD |
| Building the MIDI module into customer's own Cathedral sent to us | 120.00 USD |
| New Cathedral with built in MIDI module | 420.00 USD |
