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==HX3.7 – Preliminary Draft==

===Common Features with HX3.5/HX3.6===

* Same firmware and same FPGA sound engine
* Same PCB size, same mounting holes
* Same location of DC, USB, audio and MIDI connectors
* MenuPanel/Preset Bus Connector (I2C)
* Analog MPX Bus for newer DBX, PTX and ANX boards
* Auxiliary MIDI out, Fatar scan and pedal scan connectors

===Omitted Features===

* No onboard drawbar inputs
* No onboard button/switch inputs

===Additional Features===

* All ExtensionBoard features integrated
* Integrated 11-pin Leslie control, ExtensionBoard pinout on 14-pin box header
* Additional DAC, outputs for plain organ and pedal signal
* Headphone Amp
* Improved DAC filters
* Insert Loop (mono effects insert between tube amp simulation and rotary simulation)
* 3 onboard MIDI connectors (2x IN, 1x OUT)
* Audio output jacks may be jumpered as L/R mono jacks, stereo L/R and stereo headphone jack
* Additional output signals and effect loop input available on 16-pin box header and 3-pin Wire-To-Board connectors
* JackExtension PCB available for additional MIDI and audio input/output jacks, same jack location as old extension board

MIDI output jack may be mounted on mainboard (new hole for connector necessary) or JackExtension board (old location of MIDI OUT connector) alternatively.
HX3.7 will no longer support „legacy“ Panel16 and DB9/DB9-MPX boards. For OEM installations, we will offer an interface board providing connectors for legacy hardware. However, we strongly recommend I2C bus („Panel“ connector) and MXP bus (analog scanning) circuits as this greatly reduces wiring effort. Refer to our DBX, ANX and PTX schematics for MPX bus interfacing (using 74HC164 shift registers and 4066 analog switches) and Preset16/Vib8 schematic (using PCA9554A and PCA9555 port devices) for I2C bus interfacing.