For music practice.
Recording your music play on practice is very good to improve your performance.
This Audio Recorder is best for your self music training.

This app has Recordings List screen, Recorder screen, Player screen and Export screen.
From the Recording List screen, you may navigate to Recorder, Player, Export screen.

Recorder
Large recording start/stop button
Delay start -- Count down start recording so that
you will have some seconds to prepare your instruments or
make a deep breath before actually start recording.

Recording format: Apple Lossless
Sample Rate: 44100/Sec
Stereo/Monaural -- depends on the mic*
Input level adjust -20dB -- +20dB
Pan adjustment
Reverb Effect
Delay Start 0 - 10 Seconds
Monitoring On/Off *
No Sleep Mode On/Off

*iPhone's internal mic is monaural.
Stereo input is only available when an external stereo mic
accessory is connected with the doc connector or lightning connector.
3.5 audio jack cannot be used for stereo mic input.

*Monitoring is only available while headphone is connected to jack.
If you use External Stereo Mic to the doc or lightning connector,
Do not connect the headphone with mic input. iPhone automatically select
headphone mic as input device.
So just use the headphone without mic.

*Recorder is able to continue recording while iPhone goes in to sleep.
But if you do not want the recorder screen hidden while recording,
select No Sleep Mode.

Player
Large Play/Stop button
Speed change rate 0.5x 1.5x 2.0x
A-B Repeat

Export
Export Format: AAC(.m4a)/Apple Lossless(.m4a)/IMA4(.aifc)/AIFF(.aiff)/Wave(.wav)
Dropbox upload *
Mail Attach

*You need Dropbox account

Recommend Model
iPhone4S, iPhone5, iPod Touch 4th Gen and after

External Mic tested
-TASCAM iM2