Monday, December 24, 2012

Hello Ethel

Something done with Ethel, a new poly noisemaker...

Friday, November 30, 2012

This link is to the original project for a square wave midi synth, which I based my synth on, and has the info you would need to put the midi together, although the pins are different in my current  version. See the previous post below. You just need the midi input circuit on a breadboard, and a midi jack, I cut one off of an old PC midi adapter. The Launchpad itself is $4.30 from Texas Instruments.

Wednesday, November 28, 2012

Monday, November 19, 2012

` More Lucy. Ignore the guy in the hat!

Low-Res Lucy PWM Synth code --Current Version of Code

Here is the current code. HW UART is used to read the midi data, and attack and LFO controls have been added, as well as an equal no. of Hz detune on osc3. Note that the pins have changed-- midi in is now 1.2 and out is 2.2.

Here is an audio sample:

Wednesday, November 14, 2012

Lucy song

All Down The Line
This is the first real song I've done using Lucy (as well as other instruments). It now has hardware UART, which makes the midi in much more stable. A few enhancements and finishing touches and I'll post the new code for it!

Wednesday, October 31, 2012

Current Lucy Demo

Here's the current version of Lucy. I will post the code after I clean it up. Notes still sometimes stick, so I may try another MIDI parser that is also on 43oh.

Thursday, October 18, 2012


Here is a clip of how the Pulse Width Modulation synthesizer can sound. A little discordant here and there on this--- intended as an example of sounds it can make.

"Lucy" code

here is the messy   main.c for Lucy

"Lucy" PWM Synthesizer

I've completed (modified code) a synthesizer built on the MSP430 Value Line Launchpad. It uses the msp430g2452 chip. It has MIDI input and two oscillators- osc 2 can be detuned and mixed in at different volumes. 

This is based on NatureTM's simple midi synth on the 43oh forums. It. uses Pulse Width Modulation to create its sounds==> no DAC used, it is a 1-bit output synth. There is something similar(but without MIDI control) on another MCU platform. Unlike that PWM version, this has the cycle time variable on the first oscillators pitch, so there isn't a whine from a fixed cycle-- the duty cycle controls the sound of the second, detuned oscillator. Detuning and volume of oscillator 2 are controlled thru midi messages, ( MIDI CC's 1 and 7 here). 

Not too bad results for a $4.30 dev board an a few parts, IMHO. I'll post the code and a clip as soon as I clean it up. No envelope yet, I haven't successfully added even an attack control, odd things start happening when I try to add that in, wondering if I'm hitting limitations of the comp speed(?).