Bob Ord
Whilst creating a 2 CHAN instrument word I found that I was
trying all the permutations and combinations of the waveforms provided with the
Music 5000 system. Also, I found that once I had the two waves I wanted,
varying the amplitude of the waves (via AMP) affected the instrument's timbre.
I needed help.
I therefore, placed eight instruments defined thus
2 CHANS
EVERY CHAN
Pure Flat Onoff
128 AMP
EVERY CHAN
Pure Flat Onoff
128 AMP
into the Mixing Desk and sent each voice a note from the
harmonic series. By varying the faders I could thereby vary the amount of a
given harmonic the resulting sound contained. Having verified that this
technique would work I set about writing the AMPLINEX Spectral Harmonic
Analyser - ASHA.
The program allows the user to set the amplitude of the
first eight harmonics of a sound and playback the result. When the desired
result is obtained the program analyses the harmonics used and tries to find
the two Music 5000 waveforms and their amplitudes that produce the same timbre.
Once these are found the program displays the result in the
following form:
"newins" [
2 CHANS
1 CHAN
wave#1 Flat Onoff
amplitude#1 AMP
2 CHAN
wave#2 Flat Onoff
amplitude#2 AMP
EVERY CHAN
]
2 CHANS
1 CHAN
wave#1 Flat Onoff
amplitude#1 AMP
2 CHAN
wave#2 Flat Onoff
amplitude#2 AMP
EVERY CHAN
]
This word, once copied, can be brought into Notepad and,
after the command
1 VOICES
is entered and f1 pressed within Notepad, checked to ensure
that the timbre is correct.
Only seven keys are used by the program, they are:-
Cursor right and left
Move the blue box cursor right and left and thus select the
desired harmonic.
Cursor up and down
Set the amplitude of the selected harmonic.
Delete
Resets the selected harmonic to zero.
Return
Plays the sound shown on the screen.
Copy
Starts the analysis of the spectrum shown on the screen.
This may take quite a few minutes depending upon the sound spectrum entered.
Related file on this disc:
Published in AMPLINEX 013, September
1989
