Measure-29 on XO 1.5

[tabitha]

Sound slider when moved past approx 90% on the range of the oscilloscope goes erratic. Math bug in display? It goes vertical and spikey and off screen all of a sudden.
Still works when you take the slider back.
Sugar build 54 on XO 1.5. Firmware Q3A18.

[walter]

If you use alsamixer from the Terminal activity and then turn off mic boost then it seems to work as expected.

I'll investigate setting the proper parameters on launch.

[GenJamGuy]

The problem is due to the way the slider is mapped to capture_gain in the cb_page_sizey() method of toolbar_side.py. Instead of mapping the continuous slider position to the capture_gain with a formula, it is mapped discretely to one of 5 fixed levels in an if/else block. The discontinuity at the "approx 90%" point is caused by that point being a threshold between a gain of 100 and a gain of 300.

From a user interface perspective, one could change the slider to lock on one of 5 positions and keep the discrete mapping to capture_gain. A better solution would be to map the continuous slider position to a continuous capture_gain, provided the hardware supports more than 5 sensitivity levels.

[walter]

I've removed the crazy math from the slider in the version in git. (The code had been hardwired for the XO 1.0 hardware that had only 4 levels.) Hope to have this sorted out when I release v30. See Ticket #1070

[walter]

Should be fixed in v30.