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* convert to web components
https://developer.mozilla.org/en-US/docs/Web/API/Web_components
** don't trawl dom when setting up behavior
since it's a custom element, we should know its exact layout at all
times, so ~querySelector~ shouldn't be necessary.
* well-tempered scale
| semi-tones | freq | just | interval |
|------------+-----------+------+----------|
| 0 | 1 | 1:1 | I |
| 1 | 1.0594631 | | IIb |
| 2 | 1.1224620 | 9:8 | II |
| 3 | 1.1892071 | 6:5 | iii |
| 4 | 1.2599210 | 5:4 | III |
| 5 | 1.3348399 | 4:3 | IV |
| 6 | 1.4142136 | | Vdim |
| 7 | 1.4983071 | 3:2 | V |
| 8 | 1.5874011 | 8:5 | vi |
| 9 | 1.6817928 | 5:3 | VI |
| 10 | 1.7817974 | 9:5 | vii |
| 11 | 1.8877486 | 15:8 | VII |
| 12 | 2 | 2:1 | VIII |
#+TBLFM: $2=2^($1/12)
| degree | 3:2 | 2:1 |
|--------+-----------+---------|
| 1 | 660. | 880 |
| 2 | 990. | 1760 |
| 3 | 1485. | 3520 |
| 4 | 2227.5 | 7040 |
| 5 | 3341.25 | 14080 |
| 6 | 5011.875 | 28160 |
| 7 | 7517.8125 | 56320 |
| 8 | 11276.719 | 112640 |
| 9 | 16915.078 | 225280 |
| 10 | 25372.617 | 450560 |
| 11 | 38058.926 | 901120 |
| 12 | 57088.389 | 1802240 |
#+TBLFM: $2=440*(3/2)^$1::$3=440*2^$1
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