Different channels and busses

Simple-Does using separate busses for audio and instrument tracks in cubasele8 keep the recorded or live sound from mixing together(interfering) with each other, thereby producing a better sound opposed to having both tracks on the same buss and same channel?<br />I'm having trouble with good instruments from cubasele8 and good third party instruments when played on two separate tracks but using the same channels and the same busses...so what can I do to get each instrument, say a piano and then a violin keep a "separate" sound or dynamic when played or recorded as piano on instrument track #1 and violin on instrument track#2.Can you show me how to route them separately and still monitor them live? I tried and somehow one instrument will play and not the other..
 
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