Cannot get low latency with USB audio gear

[StuartR]

On p. 66 of Glitch Free, it says:

ACPI.sys will often show slow DPC latency times on battery powered machines. Do not disable the ACPI driver nor the Microsoft ACPI-Compliant System device. Rather, disable the “ACPI compliant battery” or “Microsoft ACPI-Compliant Control Method Battery” device. Unfortunately you’ll lose you battery icon and some power management settings.

I discovered a free update of an “ACPI compliant control method battery driver” on a web page. Should I install it? The PC is plugged into AC power.  Would it be better to Just take the Glitch Free recommendation to disable battery?

I wouldn't install any non-vendor supplied updates. I'd advise that you DO now update the BIOS from the vendor site. If LatencyMon still shows high ACPI DPC times then disable the ACPI battery driver (which is want I had to eventually do). Let us know how it goes... You'll get there.