DoubleTime now can play audio in the background. You can switch to another app and the metronome will continue as long as no other app is outputting audio.
Also, DoubleTime now recovers gracefully from audio interruptions such as phone calls.

DoubleTime Metronome now produces sound even when your device's ringer is off.

Added ability to change tempo by the standard increments used on traditional metronomes (40, 42, etc all the way to 208), which are larger than 1 and are bigger for higher tempi. Use the new double arrows for this. Very useful for getting a passage gradually up to tempo when practicing.

Updated for 64 bit — takes away the "this app may slow down your phone" warning.

Fixed issue with sound not returning after a phone call was received.
Fixed typo in the instruction section.
Extended metronome's lower range to 25 bpm.