source file: m1523.txt Date: Thu, 03 Sep 1998 12:57:49 +0530 Subject: Synth tuning using keyboard split From: Drew Skyfyre I wrote : >> >>Just using a keyboard with atleast one split point, it is possible to >>fool around with many equal temperaments. I've been giving it a bit of >>thought and it should handle equal temps of upto 24 notes per octave. >>All it entails is transposing both left & right sides to the same >>"octave" range, >>then tuning the both parts to the odd numbered pitches of an ET, and >>shifting >>the channel master tune so the pitches on the right hand become the even >>numbered pitches of the scale. John L. wrote : > >You could do quartertone scales this way, but not any other nTETs. If you get creative with it and agree to cope with remembering which key is what, it is possible to get many tunings with more than 12 note this way. It's not quite as simple as tuning the odd notes, and shifting to get the even notes, i.e., it doesn't work that simply for just any tuning. It does work for 19-tET. You need to take the gist of the idea and play about with it. For example, here's how to tune the first 18 notes of Wendy Carlos' Alpha tuning. (I've also done 19-tET & Wendy's Beta. Gamma is not possible with only one split.) The first column lists the first 18 notes, the second column lists the microtuning for the named keys, and the third column first shows that you have to shift the channel master tuning right hand side of the split up 234 cents and lists the cent values this results in. (This can be done by first coarse tuning up 2 semitones, and then fine tune up 34 cents. On the Yamaha PSR--530 use the RPN Fine Tune parameter values : MSB=104, LSB=0.). All units are in cents. The squiggly lines are to try and keep things in their place. Alpha,~~~~~~~~~"scale tuning"~~~~~~ PartShift First 18 notes~~~~key name~~~~~~~~~~(+ 234 cents)) 0~~~~~~~~~~~~~~~~~C~~~~~(+ 0)~~~~~~234 78 ~~~~~~~~~~~~~~~~C#~~~~(-22) 156~~~~~~~~~~~~~~~D~~~~~(-44) 234 312 ~~~~~~~~~~~~~~~D#~~~~(+12)~~~~~~ 546 390 ~~~~~~~~~~~~~~~E~~~~~~ (-10) 468~~~~~~~~~~~~~~~F~~~~~~( -32) 546 624~~~~~~~~~~~~~~~F#~~~~~(+24)~~~~~858 702 ~~~~~~~~~~~~~~~G~~~~~~ (+2) 780~~~~~~~~~~~~~~~G#~~~~ (-20) 858 936 ~~~~~~~~~~~~~~~A~~~~~~(+36)~~~~1170 1014 ~~~~~~~~~~~~~~A#~~~~~(+14)~~~~~1248 1092 ~~~~~~~~~~~~~~B~~~~~~(-8)~~~~~~1326 1170 1248 1326 Please let me know if I've done something silly again. BTW, as mentioned in my other post the PSR-530 holds a different scale tuning on each channel, expanding the possiblities further. Cheers, Drew