This software is an Audio / MIDI sequencer that supports VST and is currently in a free beta test version.

One of the coolest things about this software is the real-time groove control feature on each track. Along with that, the special tuning module lets you enter not only standard MIDI notes but also microtones. The piano roll editor, polyphonic score editor, and list editor are some of the other great features that come with this software. These editors help you create and edit your MIDI tracks with ease.
An integrated audio editor is also part of the software, which lets you modify your audio clips. You can take your audio editing process to a whole new level with this feature. With 16 channel audio mixers, you can render MIDI events with native modular synthesizers and effects, giving you a high-quality final product.
In summary, if you're looking for a MIDI Sequencer that offers a lot of features, the Space Toad MIDI Sequencer could be just what you need. And while it isn't out of beta yet, it sounds like it's pretty impressive, so it's definitely worth a try. And even if you're not quite ready to jump in yet, keep an eye on it because it could be a game-changer in the music production world.
Version 3.0.2: New storage system for MIDI events that allows the creation of refrains and loops