u/supervilliandrsmoov

So I am pretty new to music production. I have 2 synths, 1 drum machine, and mpc1+. I run this all into my 30 year 4 channel numark dj mixer, that had been used with my turntables. I have been running one synth through the MPC for effects and live looping

If I want to change the audio input into my MPC to a different instrument I have to change the cables. Are there mixers that I can assign different audio sources to my MPC on the fly without disrupting the mast output to my speakers? Does this feature exist, if so what is it called, and any recommendations?