This is a presentation showing the commission project I produced for Hannes Pasqualini from Paper Noise. If you would like one similar or have any other equipment you would like modifying, please contact me.

1. Monstrous Casio Keyboard
Circuit Bend Project

2. Commission Specifications
Commissioned by Hannes Pasqualini from
Papernoise
Modify a Casio VL-tone to include:
• A low pass filter
• Two audio oscillators, with patch bay
• Voltage starve
• As many circuit bends as possible
• Mounted in a customised wooden case

3. Selecting a box
I had a selection of boxes in my workshop, luckily
I managed to find the exact size box that didn’t
need many modifications.

4. Top Panel Demo
A wooden insert panel was made using ply wood
and cut to size with a disc saw. The knobs were
used to keep a scale of perspective. The gap
around the edge of the keyboard is 1mm.

5. Panel Demo Design
I made a quick sketch using word to show how
the insert panel would look.
AUDIO OUT
ON/OFF
MOD 1 RESET
PITCH MOD 2 PITCH PITCH 1 &2
1&2 POWER
PATCH BAY
CIRCUIT BEND 1-11
MOD 1
MOD 2

6. Panel Design
OSCILLATOR A
OSCILLATOR B
OSCILLATOR A PITCH A Pitch B RESET POWER
PITCH
OSCILLATOR A
MODULATION
OSCILLATOR B PITCH FREQUENCY
OSCILATOR A OSCILATOR B L.P.F. FEEDBACK STUTTER BASS STUTTER FOLLOWER BASS FOLLOWER
The panel design was finalised in power point, the
page size was set to the same size as the panel. The
file was converted to 16-bit BMP format with the
colours inverted. This is so that the file is
compatible with the marker laser.

7. Box Logo
This is the Paper Noise logo. However, I forgot to
invert the colours, which meant that I had to make a
new plywood panel and re-etch the surface.

8. Laser Etched Panels

9. Populated Panel

10. Oscillator Circuit Diagrams
I used two oscillators on this keyboard. The first was a
Hex Schmitt Inverter Oscillator and the second was a
stepped tone generator (atari punk console). Below
are the two circuit diagrams I used.

11. Low PAss Filter Schematic
The low pass filter is a passive design, this means it
doesn’t need any power to operate, the drawback to
this design is that it reduces the output signal by a
noticeable amount.
The resistor used
was a 10K
potentiometer, so
the frequency
could be adjusted.

12. Wiring Up

13. Completed Box

14. Completed Casio

15. Casio Video

16. Online Projects
• http://www.youtube.com/user/circitfied?feat
ure=mhee
• http://soundcloud.com/circitfied