Do You know good "Box" Step Sequencers vst's?
I saw few that looking nice but they are instruments.
I looking for midi ones. Like you can assign tracks to it and sequencing.
For example like those ones but routing midi tracks or samples (like in fl studio at the end).

 

Take a look at Hy-Plugins MIDI instruments HY-SEQ32, HY-RPE2, HY-MPS2 and HY-SeqCollection2. Each one allows you to create different kinds of MIDI patterns. HY-RPE2 allows you to create 8-channel MIDI beats, by using a grid or euclidean sequencer. The other three are oriented to the creation of melody patterns, Each one sports different features. You can try the demos or even get their FREE versions, which have limited functions compared to the full, paid versions, but you can use them for free.

 

Decent freebie https://plugins4free.com/plugin/3210/

 

Something different but have a look on
MAGIX ACID Pro

it maybe does what you are looking for

 

This one is the best:

Stochas - Midi Tool | Step Sequencer by Surge Synth Team

- Open-source advanced probabilistic polyrhythmic sequencer plugin
- Stochas by Surge Synth Team is a Virtual Instrument and a Virtual Effect Audio Plugin for macOS, Windows and Linux.
It functions as an Audio Units Plugin and a VST 3 Plugin.

www.kvraudio.com/product/stochas-by-surge-synth-team
https://stochas.org
https://stochas.org/ss/

“Stochas is a revolutionary new type of step sequencer that has a unique randomization engine. Designed to work either in mono or polyphonic modes the engine will select from a set of user inputted notes and takes into consideration the probability set for each, this means Stochas can be used to create evolving melodies, rich sounding string and synth sections, unique bass lines and even chaotic yet looping drum patterns, perfect for live and recorded performances. Chord input and predefined scales, make editing and inputting patterns quick and easy, without any knowledge needed of music theory.

With the ability to create polyrhythmic and polymetric patterns up to 64 steps in length, independently on each of the 4 layers, Stochas can create interesting ideas for your next musical project, be it a Phillip Glass style classical piece with varying rhythmical and metric sequences playing against each other, to a polymeric dance style project that has more life and rhythm than the standard 4/4 patterns. Patterns can be chained and created so that little phrases can be triggered randomly during the playback sequence, this can also be used to prevent repetition of the same note if using Stochas to write a bass line or to keep the pattern evolving.

With the groove template editor, you have total control over the timing and feel of the playback in Stochas, these can also be saved and loaded into other sessions, allowing you to recreate the same feel from track to track easily. MIDI input control means that you can use any hardware controller or another MIDI channel to control Stochas, allowing for live performance control of the polymeric lengths, transpositions, the bias of the maximum number of notes played.

Features:

- Randomisation engine works in both mono and polyphonic modes.
- Groove templates with export and import function.
- Chord input.
- Predefined key and scales, including custom import.
- Note chains for phrase creation.
- up to 64 grid steps and 125 rows.
- Humanization control.
- Polyrhythmic and polymetric control.
- 4 layers and 8 patterns.
- Midi input for live performance control.”
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