Practical Usage

Tag: midi

  • MIDI experiments: A simple MIDI tester

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    While doing some research to build a simple MIDI tester, I started to study the “real world” MIDI electrical specifications out there. I also experimented with various MIDI equipment and measured some voltages. A simple MIDI tester MIDI specifications imply that a MIDI OUT circuit always provides +5 Volts, on pin 4, in reference to circuit ground,…

  • About MIDI connections: Identifying the Midi pin numbers

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    A short article to help identify MIDI pin numbers in all those circuit drawings  and photos on the internet.

  • My ultimate versatile MIDI connection board: Versatility is the key

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    My Ultimate Versatile Midi Connection Board I work with Midi, a lot. I often have to plug equipment for testing instruments, circuits and interfaces. I often need to connect more than one device to a computer or micro-controller. So I decided to build the ultimate versatile MIDI connection board that I could modify, tweak, and install…

  • Review: Alyseum AL-88c Midi Interface

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    UPDATE : 2016/10 Alyseum, the makers of this hardware product, have discontinued its manufacturing. They have a new product out, the U3-88c. It’s a USB 3 interface that provides similar functionalities, minus the Copperlan interface. The Alyseum AL-88c is a midi interface with 8×8 Midi ports (8 Midi IN and 8 Midi OUT). If you…

  • Alesis Vortex: Modify the Ribbon Controller behavior

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    Some Keytar players use both hands on the keyboard part to play more complex notes arrangements. When I need to do that, I use a regular keyboard. As explained in a previous post, “I have seen keytar players “cross-under” the support strap to use their left hand on the (small) keyboard part. I have tried…

  • MRe-2: XBee Midi emitter

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    In the previous post, I  explained that I temporarily abandoned trying to use the RFM12B radio transceiver to exchange Midi information between two devices. This post explains how I successfully used the XBee radio transceiver to achieve sending information between a Midi source and a computer. The XBee radio comes in many different versions. The…

  • Alesis Vortex: A better Manual: Functional Description and Midi Programming Guide

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    This Alesis Vortex User Guide is available as a PDF file. UPDATE 2013/11/7: Alesis posted a new firmware (1.20) and the Vyzex Patch Editing software on their site. I posted about the changes here. The new Firmware/Software combination kind of makes this page less relevant. I tested the manual programming of the new Firmware (1.20) changes.…

  • MP-1: Wireless testing and midi commands

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    The MP-1 will include a wireless interface. I decided to test the possibilities of the technology I chose. Mainly, I will be using an RFM12B transceiver to exchange data between components. So, I designed a very simple interface using off-the-shelf parts: An Arduino and an RFM12B radio. Because I wanted to test MIDI data trasmission…

  • VC-1: Volume Control Beta

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    The VC-1 is. On the left, the Silonex Audiohm opto-couplers (OC) with the electronic drivers. it has been described here. On the right, the line-buffer/impedance-controller described there. It works as expected, using two digital pins on the Arduino micro-controller to change the volume. Partial specifications I use 2.2 Mohm metal film resitors as a voltage…

  • PU-1: Emulating the Apogee Gio, Part 2

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    I have completed the second phase of this project. The PU-1 can now send commands to GarageBand/Logic/Mainstage and receive commands and other information using Midi commands (but not from GarageBand). Part 2 did not require more electronics. All additional changes were made in software. WARNING: I first picked up a guitar a few months ago,…