[LAU] Midi Filter & Merger

Hello, I am wondering, wether there is programm that can merge events from physical midiports, preferably based on Channels. Lets say, I want to merge midi in ports 1 to 4, but all messages from any of those on channel 1 are merged & routed to midi out 1, while those on channel 2 are going to out ports 2 and 3. And can additionally do some filtering, like realtime messages are only accepted on midi in 2 and routed to all outs, while only midi in 3 accepts note on/off events and adheres to above merging rules, as ports 1 & 4, which accept CC. I am aware, that a software solution maybe won't have the performance of a hardware solution, but then again, I am not aware of any, unless you are lucky and run across an old miditemp device. Ede