Sagan Technology have released v6.0 of Metro. here's some of what’s new:

OS X

• Support for OS X CoreAudio and CoreMIDI technology including the Audio MIDI Setup application.
• AudioUnit V1 and V2 plug-in support.
• Support for AudioUnit Synthesizers including Apple's built-in DLS/SoundFont II.
• Convert AudioUnit synthesizers to audio by mixing tracks.
• Real-Time audio play-through.
• Mapping of MIDI controllers to effects parameters for real time control.
• Optional floating transport window.
• High quality font support.

VST 2.0

• Support for VST instruments with up to 16 outputs using all 8 stereo aux busses.
• Convert VST Instruments to audio quickly and easily by mixing tracks.
• Real-Time low latency software audio play-through with effects while recording dry signal.
• Mapping of MIDI controllers to effects parameters for real time control. This, for example, enables the use of a foot controller to control the Wah effect of a real time amp simulator plug-in.

Audio

• Support for audio sample rates greater than 48k such as 88.2k and 96k Hz.
• Support for bit sizes greater than 16 such as 24 and 32 and 32 bit float.
• Pitch Time stretch via Scale time and Transpose to modify audio. Also option-drag regions to time stretch audio.
• Re-sampling via Scale Time.
• Improved Tempo changing with audio. Audio regions now maintain there start times when tempos are changed.
• Define silence and remove silence of audio.
• Support for reading Cubase VST plug-in effect programs (.fxp files) and banks (.fxb files).
• Greatly improved support for loading of effects stored in documents on different computers.
• Effect editor windows added to the windows menu.
• Enhanced plug-in window with field sorting and contextual menu popup.
• Much larger number of effects automation parameters can be edited and in-use automation parameters are flagged with an asterisk.
• Automate built-in effect send, dry and wet faders.
• Mix audio tracks to 16, 24 bit or 32 bit float and sample rates of 44k, 48k, 88k or 96k respectively.
• New Aux Fader VU meters.
• New Aux pan knobs.