Hi folks... Just thought I'd post some interesting comparisons between what RCT came up with on its OT 3 (Clean) calculated curve visa vi the perfect 19ths tuning I've been fooling around with. Actually RCT's OT3 liked this arrangement quite nicely. I spent some extra time today on a Hamburg D being really accurate with Tunelab as described yesterday, and when I was done tuning I turned on RCT, sampled the 6 A's and ran a quick note for note check. In most cases I got some degree of blush, and in every case there was little (almost no) movement of the spinner. I didnt get to sort out all the differences between the RCT cents offsets table, and the numeric editor in Tunlab... but for your edification here are the Note TuneLab RCT A5 2.85 2.89 A#5 3.22 3.30 B5 3.60 3.75 C6 3.97 4.19 C#6 4.34 4.73 D6 4.71 5.22 D#6 5.09 5.73 E6 5.46 6.33 F6 6.93 6.99 F#6 8.41 7.74 G6 9.88 8.47 G#6 11.35 9.41 A6 12.83 10.48 A#6 14.30 11.65 B6 15.77 12.97 C7 17.25 14.24 C#7 18.72 15.87 D7 20.19 17.28 D#7 21.66 18.81 E7 23.14 20.64 F7 24.61 22.65 F#7 26.08 25.01 G7 27.56 27.33 G#7 29.03 30.28 A7 30.50 33.71 A#7 31.98 37.70 B7 33.45 41.69 Interesting that the RCT really stretches the top notes on a so called "Clean" stretch. This is way beyond the 3rd partial of the octave 5th below, tho this is only for the last 4 notes. Otherwise the perfect 19ths starts out just a little lower, then at F#6 goes sharp of RCT's curve as much as 3 cents at C7, and there after RCT starts to catch up again. These are fundemental (first partial) offsets in both cases, but in Tunelab they are also the exact frequencies of the 3rd partial for the octave and 5th below each note. For example the 3rd partial of A5 is exactly 23.14 the fundemental of E7. In other words.. how RCT' curve wanders around the actual 19ths for these notes by comparing the RCT calculated values to the real frequencies for these as read in useing Tunelab. RCT's curve starts out by holding the 19th just a tad wide, then it gets narrow by as much as 3 cents... and in the end gets wide by around 10 cents. Not exactly an exponential development. This is a lot of fun and its interesting for me... so I intend to get as complete and accurate a comparison of these two approaches to tuning as I can. But one thing is already clear. In terms of general stretch attributes.. the perfect 19ths is quite viable... and its a very simple thing to accomplish. RicB Richard Brekne RPT NPTF Griegakadamiet UiB
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