iAnalyzer for iPhone / iPad

I'd not noticed this analysis app before but it looks pretty amazing if expensive and now has iPad support too. Here's the write up:

iAnalyzer is a FFT based professional software to analyze the audio signal for iPhone and iPod Touch.
Features:
-High performance software design for Real Time Analyzing(RTA) and complex graph displaying.
-Works on 44K sample rate, 20~20k Hz frequency output.
-FFT spectrum, Octave and 1/3 Octave result display.
-Colored curve depend on the dB value.
-Flex FFT size, 4K, 8K, or 16K.
-Reference Pressure configurable.
-2D or 3D or Mix 2D&3D display.
-History result display while in 3D mode.
-High precision peak frequency computation(average-error < 0.1%).
-Auto peak frequency tracing, up to 3 peaks can be displayed simultaneously and each one be linked from text to the graph clearly.
-Frequency to music scale converter, you can use iAnalyzer as a professional instrument tuner, or to test if any sound is tuneful.
-Touch in the result area to use the measure line, bordered label means where is a peak.
-Current waveform display and summary waveform display.
-Record at any position and red color to mark the latest recording, unlimited recording time.
-Play back the recording.
-Move in the waveform area or touch on the bottom of the area to change the current position, iAnalyzer re-compute and update graph automatically. You can also change the position while playing.

Note:
-The internal mic of iPhone first generation can only works on 8K sample rate, you need head-set to achieve 44k.
-For more information, Please visit http://phyar.cn .

How to Use:
-Touch and move in the result area with one finger to use the measure line.
-Touch and move in the result area with two fingers to rotate the 3D graph.
-Touch and move in the summary waveform area to move the current position.
-Tap in the scroll bar area to re-seek the current position.

iAnalyzer at the app store: