Seven Systems released Xequence. This MIDI Sequencer arrives with Virtual MIDI support as well as the promise of Audiobus 3 MIDI in a future update. The v1.0 feature set is pretty impressive, considering this is the first music app from this developer; whose previous efforts include a leveling tool. I really like the look of this one too. The interface looks professional and powerful.

The base app is $5, which they consider a demo. To unlock "unlimited tracks" requires a $9 In-app Purchase.

Xequence | MIDI Sequencer iTunes Description:

INTRODUCING:

An advanced linear MIDI Sequencer and Keyboard / Controller for iPhone and iPad.

NOTE: This app does not produce any sound by itself! It is meant to control OTHER apps via Virtual MIDI.

HIGHLIGHTS:

- Efficient User Interface for an amazing editing workflow on a mobile device
- Scale-Aware Keyboards and Pianoroll Editor: All modules and functions observe the current instrument's scale
- 16 scales included
- Extremely tight, best-in-class MIDI Out timing
- 100% accurate song looping, no dropouts/jitter at loop points
- Robust controller (CC) handling with backtracing (inside parts)
- Supports any time signature
- MIDI In and Thru with full re-channelization and re-routing to currently selected instrument
- MIDI Sync Master (Clock / Continue / Stop / SPP) - other DAWs can run in accurate sync with Xequence, e.g. to use audio tracks
- Works perfectly with e.g. AUM or Gadget as hosts / sound generators, or with Beatmaker 2 for synced audio tracks

ARRANGER:

- Unlimited Parts
- Unlimited Tracks via In-App Purchase, 4 tracks out of the box
- 64 Undo/Redo steps
- Per-track non-destructive Swing and Delay (timeshift +/- 200 ms)
- Any Track can be routed to any Instrument
- Parts can be independent or linked (editing the original modifies all the copies)
- Looped parts
- Selection tools: Marquee/Rectangle, Same Track, Same Instrument, Linked Parts, Invert
- Two selection modes: Add & Replace
- Editing tools: Create Copy, Create Linked Copy, Unlink, Split, Join, Convert loops to parts
- All edits can be performed across multiple tracks and parts
- Individual Parts can be named
- Per Track Mute/Solo
- Draw mode
- Position/Length Handles at screen edges for efficient editing

PIANOROLL EDITOR:

- 256 Undo/Redo steps
- Fully scale-aware, all editing operations consider the current instrument's scale
- Relative or absolute grid: Snap Events to nearest grid line, or move by grid increments
- Live Auditioning of all edits and mini keyboard keys on the left
- Selection tools: Marquee/Rectangle, Same Note, Same Key, Same Beat Position, Invert
- Two selection modes: Add & Replace
- Editing tools: Copy, Legato, Quantize, Quantize Ends, Transpose +/- 12, Fill part with selection
- Smart Draw mode: Touch to create, touch again to delete, drag up/down to transpose, drag left/right to change length
- All editing settings remembered intelligently. It works like magic! (tm)
- Note velocities can be edited as if they were controllers, see below:

CONTROLLER EDITOR:

- 256 Undo/Redo steps
- Selection tools: Marquee/Rectangle, Same Beat Position, Invert
- Two Selection modes: Add & Replace
- Editing tools: Copy, Reduce, Quantize, Compress/Expand, Fill part with selection
- Smart Draw mode
- Automatic removal of redundant controllers
- Velocities of notes can be shown as controllers and edited with the same tools

KEYBOARD / CONTROLLER:

- Fully scale-aware single or dual keyboards
- Base key and last played notes highlighted for easier orientation
- Three modes: Scroll, Glide, Lock
- Three available key widths
- Up to three CCs (controllers) can be shown as touch bands next to the keyboard
- All three CCs can be controlled either via touch or device rotation (up to three axes simultaneously), with pickup
- Velocity emulation option (via vertical position on key)

INSTRUMENTS:

- Unlimited Instruments (an Instrument is a MIDI destination + channel)
- Up to 3 definable CCs (Controllers) per Instrument
- Compatible with virtually ALL synths and hosts

VARIOUS:

- MIDI Metronome
- Ruler can be either fixed or modal (hidden automatically after use, to preserve screen space)
- In-App hints for important features

COMING IN AN UPDATE:

- Audiobus 3 MIDI
- MIDI file import / export
- "Open In..." support for importing and exporting projects
- ...and many more!

ISSUES:

- No tempo or time signature tracks
- If you want to use MIDI hardware, you might need an app like MidiBridge

FIRST RELEASE! Please report bugs via our site!