A short and very simple piece demonstrating a 9-tone subset of 31 equal divisions of the octave: intervals 7 2 4 5 4 1 1 2 5 (degrees 0 7 9 13 18 22 23 24 26) - in response to Andrew Heathwaite's suggestion to come up with some novel non-MOS 9-tone scales in 31edo.  Recorded in Reaper with Axis-49 and two instances of XenFont (sampled vibraphone and harp sounds).

short demo of mode 724541125 of 31edo

Solo improvisation for (sampled) metallophone or something, exploring a pentatonic scale (mode 25252 of 16edo).  Recorded with Reaper, Axis-49 and Xenfont.  Sort of gamelan-inspired (although actual gamelan music isn't generally made with a computer, or in this sort of tuning, or even solo as far as i know :> )

2013-07-13 improv 1

solo electronic improvisation.  long sustained feedback-like tones with very slow attack and decay.  uses a just-intonation tuning (2.7.11.13 tonality diamond).  made with Axis-49, Reaper, XenFont.

2013-08-08

Solo improvisation for (sampled) harpsichord.  Edited only to fix a couple of really awful notes :)

The tuning is <a href="http://xenharmonic.wikispaces.com/Kleismic+family">kleismic[</a>15] (also known as hanson or keemun) in 53ed2 (generator 14\53), as proposed by <a href="https://soundcloud.com/jdfreivald">Jake Freivald</a> in his "three-tuning challenge" (Facebook, 2013-09-03).  As a mode of 53ed2, it is 3 3 3 5 3 3 3 5 3 3 3 5 3 3 5 (4L+11s).

Made with Axis-49, Xenfont and Reaper.

2013-09-08

improv for (sampled) reed organ in just-intonation nonoctave tuning - 3.11.13 tonality diamond, normalized to period 3/1 - as suggested by @jdfreivald, since today's date is "3.11.13" :)

the scale: 1/1 - 13/11 - 11/9 - 13/9 - 27/13 - 27/11 - 33/13 - 3/1
(in cents: 0 - 289 - 347 - 637 - 1265 - 1555 - 1613 - 1902)

made with XenFont and Reaper.

organ improvisation 2013-11-03

a short multi-take improv, slightly edited; bass, drums and marimba (all sampled).

second piece of the day exploring a just-intonation nonoctave tuning - 3.11.13 tonality diamond, normalized to period 3/1 - as suggested by @jdfreivald, since today's date is "3.11.13" :)

the scale: 1/1 - 13/11 - 11/9 - 13/9 - 27/13 - 27/11 - 33/13 - 3/1
(in cents: 0 - 289 - 347 - 637 - 1265 - 1555 - 1613 - 1902)

made with XenFont, Sforzando, Reaper, and the Gregjazz Jazz Funk Kit...

short piece 2013-11-03

The 13 EDOs of Xmas

A triad of filtered sawtooth waves.  The outer notes remain constant at 1/1 = 200 Hz("root) and 3/2 = 300 Hz ("fifth").  The inner note ("third") sweeps slowly from 500 cents ("fourth", approx 4/3) down to 200 cents ("second", approx 9/8), at a rate of 1 cent per second.  Therefore, the pitch of the third at time t (in seconds) is (500-t) cents.

Generated with the following Supercollider code:
(
// sweep at linear cents rate
{
Pan2.ar(
	in: LPF.ar(
		in: Mix.new(Saw.ar(
			freq: 200 * [ pow(2, Line.kr(start: 500, end: 200, dur: 300, doneAction:2) / 1200 ), 1/1, 3/2],
			mul: 0.3
			)),
		freq: 2000
	),
	pos: 0
)
}.play;
)

Fades added and mixed to mono in Audacity.

triad sweep 01

See http://lumma.org/music/theory/demo/brats/brats.txt , "first comparison".  I've added a just 4:5:6 for good measure, and scrambled the order.  First set is sine waves, second is triangle (not band limited); third is sawtooth (band limited).  Order is the same in each set.  Can you tell which is which?  Post your guess here or at https://www.facebook.com/groups/xenharmonicmath/permalink/647047605435465 ...

Answer key (use uudecode ):
M,2X@,3<Q+454#0HR+B`U,"U%5`T*,RX@:G5S="!I;G1O;F%T:6]N#0HT+B!M
M971A;65A;G1O;F4-"C4N(#4S+454#0HV+B!M971A<V-H:7-M:6,Q#0HW+B!M
.971A<V-H:7-M:6,R#0H`
`



chord tunings test lumma brats 1 sin-tri-saw

Demonstration of basic synthesized waveforms @ 300 Hz:
1) sine
2) triangle
3) square
4) sawtooth

Made with Supercollider (SinOsc, DPW3Tri, PulseDPW, Saw).

basic waveforms

another clip of basic playing techniques.

Scott Thompson

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