If you registered version 3.3 after February 11'th 2004, the version 4 upgrades are free.
However, registration prior to that date does cost $25.
Below is the contents of an email I received from Flavio .................
n-Track Studio v4.0.4 has just been released!
____________________________________
Download the new version following the download link from the n-Track
homepage
http://www.ntrack.com
n-Track Studio is a multitrack recording program with support for
realtime effects as DirectX and VST plug-ins, audio and MIDI tracks, 24 bit
soundcards and more.
Download the evaluation version of the program at
http://ntrack.com/download.shtm
Buy the program now at
http://ntrack.com/register.shtm
If you've registered n-Track Studio after the 11th of February 2004 the
upgrade to all 4.x versions is free.
If you've registered the program prior to that date you can upgrade to
n-Track Studio v4.0 for $25 at
http://ntrack.com/upgrade.shtm
What's new in n-Track Studio 4.0.4
___________________________
- Freeze function for audio tracks, group, aux, instrument channels and
MIDI tracks (free Cpu resources used by effects plug-ins)
- Aux channels properties dialog box
- Shaded channel name/properties button
- Changed group mute/solo so that tracks not sent to a soloed group are
muted and can't send signal to aux channels
- Tooltip on volume evolution node shows volume level even when not
dragging the node with the mouse
- Fixed problem with beeps after live input processing is used for more
than 25 minutes
- Fixed MIDI notes from instruments plug-ins getting stuck
What is n-Track Studio
___________________
n-Track Studio is an audio & MIDI multitrack recorder for Windows.
A complete recording studio in your PC: all you need is a soundcard and
some free space on your hard disk to store audio data. The program
supports simultaneous recording from multiple 16 and 24 bit soundcards, and
real-time audio effects can be applied non-destructively to each track,
allowing the user to listen immediately to the result of a change in
the parameters of an effect. Built-in effects include Reverb, Dynamics,
Multiband Compression, Echo, Pitch Shift, Chorus Parmetric EQ, Linear
Phase EQ & Spectrum analyzer.
The program can use third party DirectX and VST plug-ins to process in
real-time audio signals in a number of different ways. Effect can also
be used to process the recorded signal in real-time so that the
computer can act as a multi-effects device.
MIDI tracks can be imported end exported to regular MIDI files, and
edited using the built in piano-roll based MIDI editing.
When all the tracks have been recorded and all the settings are
correct, it's possible to mix-down all the tracks to a single wave file for
recording it to a compact disk using a CD recorder or for distributing an
mp3 version through the Internet.
For more info and to download an evaluation version please visit
http://www.ntrack.com
................
It still seems to be going through a bit of bug fixes at the moment, so I'm still holding off on using version 4 exclusively. It appears to be maturing quite well though.
HTH