View Full Version : Sick day synthesizer

01-06-2009, 08:09 AM
I took a sick day today *cough* and made a CHAD polyphonic synthesizer out of a prop. Emphasis on the CH. And on the D.

I hooked up this MIDI IN circuit: http://forums.parallax.com/attachment.php?attachmentid=49850 (from this thread: http://forums.parallax.com/showthread.php?p=682346)

Then I whipped up the attached program (requires NS_sound_drv_052_11khz_16bit.spin from the HYDRA CD), plugged in my MIDI keyboard, and shot some video of our cat: www.youtube.com/watch?v=EyQJOUHT1-g (http://www.youtube.com/watch?v=EyQJOUHT1-g) (YouTube is still processing as I type this; hopefully it'll be done by the time you click.)

The sound quality is nothing to write home about, but it is polyphonic and velocity-sensitive. Anyway, it was more fun than just lying in bed... though lying down sounds like a pretty good idea right about now.

Spork Frog
01-06-2009, 09:29 AM
That actually sounds good. Though I'm also a huge fan of 8-bit music, so there ya go.

Just out of curiosity, is the heavy attack on some notes the Prop or your camera?

01-06-2009, 10:33 AM
Probably just me hitting the durn keys too hard. Velocity-sensitivity is a double-edged sword.

01-06-2009, 11:36 AM

Good to hear of your recent illness... best wishes for a belated recovery. It is scary to think what you could do with a week off.

Gastro-enteritis is going around... it is good for at least a week and nobody wants you around when you have it... it sometimes develops about five days after an upper respiratory infection.

How about a Karaoke machine?


Nick McClick
01-07-2009, 04:21 AM
Sounds better than the NoiseAxe (http://www.gadgetgangster.com/79) that Grandtippler put up! Dumb question - what's CHAD?

Gadget Gangster - Share your Electronic Projects (http://www.gadgetgangster.com) - Sign up as a Designer and get a free 4-pack of Project Boards!

Bob Lawrence (VE1RLL)
01-07-2009, 05:18 AM
I like it http://forums.parallax.com/images/smilies/cool.gif

Nick McClick said...
what's CHAD?

Most likely he's referring to:
* Roland Juno-60 - The Roland Juno-60 is a popular analogue 61-key polyphonic synthesizer produced by … Notable Juno-60 : Chad Coles (during his earlier years) …

Aka: CosmicBob

01-07-2009, 05:45 AM
Excellent work mpark :D should take a few days off work myself lol

http://www.propgfx.co.uk/forum/·home of the PropGFX Lite


01-07-2009, 06:23 AM
I highly recommend it!

Btw, CHAD = cheap and dirty. I guess it's a model rocketry thing. I thought it was more widespread, but maybe not.

Anyway, it's my unofficial motto :)

01-07-2009, 06:33 AM
I like it as well (also a fan of 8-bit music... must be a few of those around the forums).

Have to admit though that when I saw the post title ("Sick Day Synthesizer"), it brought a picture to my mind of the scene in Ferris Bueller's Day Off where he sets up the synthesizer to sound like him being sick.· That would be a good project too ;)

01-09-2009, 11:36 PM
Hi there,

i wished i could try it also...

Is there any way to get those "S_sound_drv_052_11khz_16bit.spin" legal without buying the Hydra book


01-15-2009, 04:30 PM
Sorry, uk7Of9, for that driver you'll have to buy the Hydra book. It's worth it, though.

I've started work on a completely different sound driver. Follow my latest exploits here: http://forums.parallax.com/showthread.php?p=777004.

01-18-2009, 06:25 AM
Thanks mpark

i will take a look a the link.


Sean B.
01-28-2009, 02:12 AM
The code from the book is online now:
www.parallax.com/Portals/0/Downloads/sw/HYDRASourceCodeDemos.zip (http://www.parallax.com/Portals/0/Downloads/sw/HYDRASourceCodeDemos.zip)

Though I'll probably still buy the book.