n-Track Studio Multitrack Recorder for iOS updated to v3.1

n-Track Studio Multitrack Recorder for iOS has been updated to v3.1.

New in v3.1:

• Support for inter-app audio instruments. Add an instrument app with the + button on the toolbar.
• Mixdown can now be saved in 16, 24, 32 or 64-bit audio format.
• Choose microphone on multi-mic devices and set microphone polar pattern (e.g. cardioid, omnidirectional).
• AudioCopy & Paste updated to SDK version 2.0.
• Fixed glitches on some instruments when playing with sustain on.
• Fixed crash when calling 'Open track in…' command, which now appears long tapping on an audio track.
• Fixed removing an instrument may alter output setting of other MIDI tracks.
• Fixed glitches changing song loop interval during playback.

New in v3.0:

• Built-in metronome with programmable tempo changes.
• EQ now appears as a popup window.
• 2D frequency spectrum sonogram.
• iOS 7 compatibility.

New features available via in-app purchase:

• MIDI tracks with built-in multi instrument synth.
• MIDI editing in the Piano Roll window.
• On screen MIDI keyboard.
• Support for external MIDI keyboard and inter-app MIDI.
• 3D frequency spectrum.
• Support for multiple audio output when using compatible USB devices.