The Space Toad MIDI Sequencer is an Audio / MIDI sequencer for Windows XP/Vista/7. It is still under development but alpha and beta releases can be downloaded here.

Version 3.0 (with audio file support) is now available as an alpha release. The old version 2.1.1 (which had VST support but no audio file support) can still be had (from the “Download” button on the left of the toad). In the new version there may be some things left unimplemented and there is hardly any documentation. But it is (basically) a working system and whoever feels inclined to support development or just have a look at it can download it below. Don't forget to send a report if something should not work (webmaster@spacetoads.com).

These are the things the 2.1.1 version could do:

Record from MIDI keyboards and play it back on internal VST plug-ins as well as external MIDI synthesizers

Let the user edit MIDI events via three different editors (Piano Roll, Event List and Score)

Provide Grid Quantization as well as Groove Quantization

Let the user edit MIDI data with advanced tools like logical filters and transformers

Host 16 VSTi instruments as well as VST effects

Provide some build-in audio effects in addition

Record VST parameters

These are the things the 3.1 version can do no more:

All the VST related stuff

And here's what the new version can do the old one could not:

Integrate Audio Clips into the MIDI score using an adaptive synchronization scheme

Provide an integrated Audio Editor with a lot of weird spectral processing tools apart from the usual cutting stuff

Render MIDI data through a build-in synthesizer frame with selectable components

Support different synthesis methods within this synthesizer frame: Virtual Analog, Sampling, Wavetable, FM, Additive

Support Just Intonation and Microtonality via an internal data base of tunings and modes

Send MIDI synchronization to other sequencers

Change the groove of a track in real-time (the old version could do this offline only)

To a limited extent recognize polyphony while interpreting MIDI data as a score in real-time

Optimize the performance of the audio engine on dual-core and quad-core CPU-s