I have a A4 and Microbrute. The A4 really stretches the capabilities for modulating. The Microbrute is a beast of synth by itself and punches well above its weight with the A4 connected to it. No video though. I made some custom 1 x 1/4" to 2 x 1/8" cables to connect to the MB and my growing Euro rig without having to use adaptors.

Another great and inexpensive option would be the Pittsburg Modular Block

http://www.novamusik.com/pittsburgh-modular-synthesizers-synthesizer-block-eurorack-module.html