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MIDIGEN – A (belated) LEMS postscript

This short article discusses an add-on to the following:

The Brute: A 3-channel Audio Amplifier For Leslie Speaker Emulation.
Treslie: 3-Phase Leslie Speaker System.
LEM: Leslie Emulation Control System using PIC Microcontroller (18F26K20) based on Pequeno board, (Arduino-alike) and 3 DACs.

Shortly after completing LEMS, The Brute and Treslie, (see links above) it became apparent to me, that [...]

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LEMS – A Leslie Speaker Emulation System

Updated: 16th July 2011 @ 3:02am
This post describes the design and construction of a Leslie Speaker Emulation System (LEMS) control unit, based around an 18F26K20 PIC Microcontroller. The unit is intended to be used to split an audio signal into 3 phases, amplitude modulate these and feed to a Leslie Speaker Emulation driver unit [...]

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MIDI Chord Button Keyboard Using PIC Microcontroller – 3

MIDI Chord Button Keyboard Using PIC Microcontroller – Part 1
MIDI Chord Button Keyboard Using PIC Microcontroller – Part 2
MIDI Chord Button Keyboard Using PIC Microcontroller – Part 3 (This Page)

Connections
The following table documents the connecting leads and molex pin-header numbers tying the various interfaces together.

Header
Pin no.
Signal/Function
Direction
Header
Pin no.
Signal/Function

Chord Controller-SV1
1
RD7
——>
Matrix Decoder-SV4
1
Chord Sel. C

Chord Controller-SV1
2
RD6
——>
Matrix Decoder-SV4
2
Chord Sel. B

Chord [...]

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DB50XG Voice Selection Table and Routines in ‘C’

I recently completed and implemented code on a PIC18F4620 to talk to my two DB50XG units. Since the code is in ‘C’, and might prove useful to others implementing such code, I’ve provided a hard-copy (DB50XG.c) snapshot of the relevant sections from my code and give a brief extract of these below.

The XG Voice List [...]

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MIDI Chord Button Keyboard Using PIC Microcontroller – 2

MIDI Chord Button Keyboard Using PIC Microcontroller – Part 1
MIDI Chord Button Keyboard Using PIC Microcontroller – Part 2 (This page)
MIDI Chord Button Keyboard Using PIC Microcontroller – Part 3

How chords are formed
Before discussing the processor board and software, it is worth mentioning how the chords are composed. I have provided the table below which [...]

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MIDI Chord Button Keyboard Using PIC Microcontroller – 1

MIDI Chord Button Keyboard Using PIC Microcontroller – Part 1 (This Page)
MIDI Chord Button Keyboard Using PIC Microcontroller – Part 2
MIDI Chord Button Keyboard Using PIC Microcontroller – Part 3

Every time I sit down to document one of my projects, I try to remember the occasions in the past when looking at the finished web [...]

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The MIDI Guitar – 1: Analog scanning of the Guitar Fretboard

For some time now, I have experimented with producing MIDI signals from a Guitar. Yes, I know there exist a choice of existing systems, but they all have both limitations and drawbacks, the worst of which are:

Cost
Limited to certain Guitar Models
Irreversible changes required to fit
Unsatisfactory string-bending capability

My documented antics with guitars have created much [...]

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What are you looking at?

I’m always a little curious to see what posts are popular, and why. This involves checking the statistics on the site, and can be an eye-opener.

I’ve listed the Top 10 posts obtained from the stats this morning, and these are given below for your information. My assessment is that most readers of the blog seem [...]

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Towards a better Guitar-to-MIDI Converter

Most Guitar-to-MIDI converters are a grave disappointment. Recently, I’ve been playing with the idea of adding electronic scanning to one of my guitars and using this to output MIDI – it works but has several disadvantages, not the least being that it involves irreversible surgery to a guitar. My prototype is a £35 (GBP) second-hand [...]

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Make a Yamaha Synth for less than £25.00

Introduction
Specifications

First take a look at the specifications listed alongside. Look familiar? Well, to Waveblaster fans probably, as this is the spec. of the Yamaha DB50XG daughterboard, a phenomenally successful product in a long line of excellent audio/MIDI offerings by Yamaha.

For a while now, I’ve come across articles on using a second-hand DB50XG (or clone) as [...]

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