From Audiofile Engineering:
Backline Calc is now 100% free!!!Backline Calc is a full-featured musical calculator built exclusively for iPhone and iPod touch, brought to you by the minds at Audiofile Engineering. Combining powerful, elegant and uncluttered audio utilities with unparalleled technical support, Audiofile Engineering is one of the most innovative and experienced audio software developers for Mac OS X and the revolutionary iPhone.Backline Calc is an indispensable utility for engineers, musicians, music students and teachers, producers, DJs, video and broadcast engineers and live sound engineers. Backline Calc is iAd-supported and contains 23 easy-to-use calculators:Length- Note LengthTimecode- Frames to TimecodeFiles- File SizeLength- Bar Length- Song Length- Beats to Tempo- Time to Samples- Compare Tempos- Change Tempo- Sum Times- Subtract TimesPitch- Note Name to...- MIDI Note to...- Frequency to...- Wavelength to...Timecode- Convert Timecode- Change TimecodeElectric- Compare Power- Compare VoltageAcoustics- Distance to Time- Time to Distance- Sound Pressure Level (SPL)- PanningUsage Note: You can tap a value (eg. BPM) to manually enter it.
What's new in this version:
- now completely free with no ads- updated "About" screen