Hardware Reference
In-Depth Information
In
Table 6-5
,
xxxx
is an “ignored value” and
vvvv
is “down if zero.”
The web service mechanism is a simple loop. It processes a request, has an internal
switch/case that examines the upper nybble of the
message
value, and applies changes
as required.
No matter what the requested operation is, the Alcyone responds with three integers
in plain text, which correspond to the current octave, the current transposition setting,
and the current MIDI channel. The JQuery-based request reads these three integers
and populates the web page with the current instrument status.
Ergonomics
An implemented schematic and working software (both embedded and external) are
all well and good, but they all ignore the actual aspect of playing the Alcyone.
The Alcyone is designed to be played by standing guitarists. It is not likely to be played
delicately.
In order to be useful, it must be mounted in a case that offers the following qualities:
• Heavy enough to allow stability for the pedals. It would be unfortunate for the
musician if the pedals moved during performance (as many stage configurations
are laid out for the convenience of the performer, and often monitors are aimed
in specific ways). It would be even less fortunate for an audience member if the
Alcyone were to somehow be launched at him or her.
• Tough enough to handle being stepped on thousands of times, by a full-grown
adult.
• Pedals low enough so that the musician's ankle is comfortable while playing the
instrument.
All of the “white keys” were replaced with wooden keys made from wood meant for a
picket fence cut down to size to match the existing pedals (roughly six inches long).
These are more likely to be immediately durable as compared to the original organ
pedals (which would be decades old).
As for the external container, the Alcyone has a wooden case built from 2 × 4 wood
and shellacked fencing, giving it a rustic look (which has its own appeal, for various
reasons) and is tough enough to handle rough treatment. With proper reinforcement,
the Alcyone is strong enough for an adult to stand on, although you probably shouldn't
jump on it. It's not a percussion instrument!
—
Joe Ottinger
