AMPLINEX Spectral Harmonic Analyser

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

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

]

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:

U.ASHA - AMPLINEX Spectral Harmonic Analyser