Impromptu has been updated to v1.3 (Universal Binary) for Mac OS X 10.5+ (Version 1.2 is still available for users of 10.4.x).

The most substantial addition to 1.3 is the inclusion of a set of custom AudioUnits designed specifically for programmatic use in Impromptu. They do not provide UI's but instead provide programmatic support for such things as loading, playing and recording audio-sample data, returning FFT data, setting up feedback loops etc. These AudioUnits are low level (i.e. UGens) and when used in conjunction with Apple's shipping AudioUnits (filters, reverbs, delays, etc.) provide a more programmatic method for playing with synthesis processes directly within Impromptu.

The following set of Audio Units are included:

• ImpromptuAnalysis
• ImpromptuConstant
• ImpromptuGate
• ImpromptuMultiplier
• ImpromptuNoise
• ImpromptuOscillator
• ImpromptuRecord
• ImpromptuSampler
• ImpromptuSplit
• ImpromptuSum

The metro (make-metro) library is now included as standard in impromptu 1.3. Also included in Impromptu 1.3 are the macro's - play setp getp setpn and pb:cb.

There are many new functions in this release, particularly in the gfx: gl: au: and objc: pseudo namespaces.

There is also a new FAQ section that will hopefully be growing steadily over the coming weeks and months.