master pitch problems

Whorld's Master Speed parameter must be compensated for master pitch changes. This is non-trivial because it's a logarithmic value mapped to a linear normalized parameter. The formula to determine the correct Master Speed parameter for a given pitch is:

ff_speed = ((log(whorld_speed) / log(20)) + 1) / 2

where the nominal pitch is 1.0 (100%), half-speed is 0.5 (50%), double-speed is 2.0 (200%), etc.

Some examples:
whorld  FF
1.0     .5
0.5     .384311
2.0     .615689
.6666   .432326211
.27     .281466900

Time Blur must also be compensated. The solution turns out to be trivial: just divide the Time Blur by the pitch, i.e. if Time Blur is .27, and pitch is .5, Time Blur should be .54. The idea is that if you're creating half-speed data, you want to blur twice as many frames to achieve the same effect.

Other Whorld parameters:

ff_zoom = (log(whorld_zoom) + 1) / 2
ff_hue = (whorld_hue / 360)

CNumEdit bug

A CNumEdit bug was discovered While attempting to compensate Time Blur's parameter for master pitch: CNumEdit notifies the parent before the aux window (aux is a CEditSlider in this case). The parent (a row dialog) sends a notification via SendMessage instead of PostMessage, and since the recipient (main frame) reads the value from the slider, the value is stale, because the slider hasn't been updated yet. The symptom: if a parameter is edited by typing text in the edit control and pressing tab, the slider moves to correct position, but the plugin doesn't respond to the change. The solution: CNumEdit should notify the aux window first, then the parent.

This is also a problem in Whorld, but it's masked because CMasterDlg::OnNotify uses PostMessage. Using SendMessage causes the same bug to appear. With the corrected CNumEdit, CMasterDlg::OnNotify can use SendMessage without problems. This is preferrable since SendMessage is theoretically more efficient.