seaborg
27
As others have said an MPC will do this; I recently picked up an mpc 5000 which had 4 midi outs and two midi ins. Can do step recording, quasi xox, has a very high resolution which will be noticeable when playing keys from ext keyboard. Can send CC to your synths, but what i like is that you can record these midi messages and edit them via the sliders with ease, or step record, and there is like four sliders and 8 knobs freely assignable!