MIDI hardware euro-MIDECO User manual

MIDECO
eurorack module
24-outputs MIDI note decoder
USER MANUAL
Roman Sowa 2015
www.midi-hardware.com

Overview
MIDECO modu e is a decoder of MIDI notes to gates or triggers. It receives MIDI notes
via DIN5 MIDI IN jack and converts them to +5V gate or trigger pu ses, depending on
mode se ected. There are 24 outputs and each of them is assigned to different MIDI note
from continuous range in sing e MIDI channe . So if you connect for examp e keyboard to
MIDECO, a gate outputs wi represent key status (on or off) of se ected 2-octave range.
This range, or in another words – a starting note, as we as MIDI channe , can be set
using MIDI- earn button or via MIDI System-Exc usive messages.
When trigger modes are se ected, duration of the pu se can be a tered by “PULSE
WIDTH” knob and CV input. Additiona y in VELO mode, duration is contro ed by MIDI
note's ve ocity.
This modu e can on y be used when proper y insta ed in eurorack modu ar case. It
occupies 14HP and needs on y +12V supp y de ivered via standard 10-pin p ug. The
power input is keyed, so no mistake can be made using proper cab es, but in any case
MIDECO wi not get damaged by connecting power in reverse.
Modu e width is 14HP (70.8mm), depth 25mm (without power p ug inserted).

Panel & modes of operation
Upper knob is for mode se ection. Possib e modes:
GATE – output is active (+5V) as ong MIDI note is on.
Pu se width knob and CV has no use.
T IG – output is active (+5V) on y for the short time at
MIDI note start. Pu se duration is adjusted on y by Pu se
Width knob and CV
VELO – works just ike TRIG mode, but pu se duration is
affected by ve ocity of MIDI note
DUAL – odd outputs send trigger at the time MIDI note
starts, whi e even outputs send trigger at the end of MIDI
note. Each note drives 2 outputs, hence 12-note range in
this mode.
PULSE WIDTH knob a ters trigger duration, and
depending of mode and ve ocity, this is between fraction
of a mi isecond up to 0.5s
LEA N button for setting starting note and MIDI channe (setting remains after power
off) and indicator of MIDI signa . GREEN = MIDI coming in, RED = MIDI note in my

channe and within my range, ORANGE = waiting for first note in MIDI- earn procedure.
Modu e does not b ink on MIDI rea time messages ike MIDI c ock for better visibi ity. To
assign a range of 24 gates to notes, press LEARN button and p ay the owest note of that
range. From now on MIDECO wi respond to that MIDI channe , starting from that note.
There is a LED at each of 24 gate/trigger jacks to indicate that output is active.
To show how different modes affect GATE outputs, see the timing be ow. It assumes the
same MIDI note was p ayed 2 times with different ve ocity.

MIDI System-Exclusive
Starting note, MIDI channe , and mode of operation can be set a so with MIDI Sys-Ex
message of the fo owing syntax (in hex):
F0 00 20 7A 05 01 [channe ] [mode] [starting note] F7
channel must be entered as one of the fo owing va ues representing channe 1-16
according y: 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F, 10
mode se ects one of the modes just ike mode switch, and can take those va ues: 01 –
GATE, 11 – VELO, 12 – TRIG, 13 – DUAL.
Starting note as hexadecima va ue from 00 to 7F. Enter 24 for typica starting note in
5-octave keyboard.
Parameters
Power consumption: 4mA at +12V with a LEDs off, 10mA with a LEDs on. Current
may rise significant y if GATE outputs wi be (by mistake or intentiona y) shorted to
GND, a though this cannot damage the modu e. -12V and +5V rai s are not used.
Pulse duration: in TRIG and DUAL set by the knob and CV: 1-500ms. In VELO mode
dependent on ve ocity: 0.1-5ms for minimum knob/CV setting, 5-450ms for maximum
knob/CV setting.

"MIDI-hardware" Roman Sowa
u . Azotowa 15B, 41-503 Chorzów, Po and
phone [phone], emai info@midimp ant.com
© 2015, Roman Sowa
made in Po and