Otto MIDI

This is a complete MIDI module based on the Otto Stereo as front and a MIDI addon added at the backside.

Features:

Only 2HP wide
1 MIDI TRS input (Jack 1)
4 MIDI TRS Thru outputs (Jack 2-5)
3 Custom jacks that can be used for up to 3 more MIDI TRS Thru, or used freely by a pinstrip on the backside. (Jack 6-8)
3 Buffered MIDI serial thru outputs on the backside. Can be used as extra THRU outputs.
The TRS jacks are preconfigured for MIDI TRS Type A, but can be changed to Type B by changing soldering-pads.
LED indicator for incoming MIDI activity through a hole in the Otto front.

Package contents

Module with addon
2 screws
1 Eurorack power cable
1 Sticker sheet

The 3 buffered MIDI-THRU (A,B,C) pins on the backside can be used in a number of ways:

Extra MIDI THRU outputs, just add connectors.
Feed MIDI THRU to other modules MIDI input pins on the backside. Inside your rack.
Use A,B and C as “TX” and GND signals to feed your Arduino MIDI project directly to the RX pin.

The module will normally be pre-configured for TRS type A.
You can change this by yourself by changing/resoldering the solderpads.
See the manual below.

No MIDI cables included.

The 3 bottom jacks (6,7 and 8) can be used more freely.
On the back you will find a pinstrip with tip and ring pins for each of these 3 jacks.
There is also some general-purpose GND-pins on the pinstrip.
Here you can connect whatever you like, that you want to get in a stereo jack on the frontpanel, for example MIDI inputs or outputs from other modules.
You can also skip the pins and use the solderpads to configure these jacks for type A or type B MIDI TRS Thru outputs (like jacks 2-5).

Serial number from 110 and above have the addon soldered to the pinstrip and a nice dedicated frontpanel.
On earlier versions with serial number below 110, the addon have a female header and the frontpanel are the same as the Otto Passive Stereo with the numbers 1 to 8.

See youtube video here.