I've uploaded a revised version V4.11, with the following changes:
New features- Level of sweep on left ref channel automatically adjusted to get ref input to -6dB FS
- System delay measurement compensates for measurement bandwidth for sweep end frequency >= 200Hz
- Added label to show distance equivalent to the System Delay
- Data import tolerates a mixture of decimal delimiters
Bug fixes- Start time of captured data on scope plot was incorrect when using left channel as ref
- Meters were not being disabled properly when the sig gen or spl meter stopped
- When REW was used with a Creative X-Fi (and some other Creative cards) the signal generator would only work once
The main reason for this release is to fix the problem with the Creative X-Fi. The changes when using the left channel as a reference mean REW will check the level on the ref input before making a measurement and apply an adjustment to the sweep level on the left channel output to try and get the reference input level to -6dB FS. That improves the measurement S/N a little, though the additional check adds just under a second to the measurement time. REW also gives a warning if the left reference input is too low or seems to be missing.