help need - to reduce the mp3 size

dear guys, loving and learning reaper very much than others last night i have recorded a demo song it has 22 tracks , no vocals , only instruments, and durms i rendered it in MP3 format (320) and its capacity is 12 mb, running for only 4 minutes while editing i rendered fx bearing tracks to stems i checked the cpu usage in perfomance meter , it is zero Kindly advice me how to reduce the file size awaiting

I'll assume you want a smaller file size so you can eMail it or share in some other way. If you want MP3 then the only choice is to render to a lower bit rate. Try a kbps rate of 128 or 96. You will loose some quality but your files will be much smaller.

thanks bigwoody kindly clarify.... i am recording at 24 bit where is the bit adjustment you mentioned? if i have to loose some quality then kindly advice me how to avoid it ? if a pro using reaper then how he has to do? my set up: yamaha keyboard PSR, casio keyboard, the daw, pc windows 32 bit, multimedia speakers, awaiting

On the render screen, where you select that you want to render as MP3, below and to the right where it says 320, change that to 96 or 128. Like bigwoody said, it will make the file a lot smaller. Matt

thanks boos what about quality ?

Try using VBR instead of CBR to reduce file size. And sorry, but even 320 CBR is not CD quality, and 128 isn't close.

I suggest 192 kbit/s CBR (constant bit rate) for optimal quality/file size ratio while avoiding potential issues with VBR (variable bit rate) playback. Avoid anything below that to maintain a decent quality, 128 has a lot of artifacts already.

thanks boss i will render it at 128

help needed 

guys, i decided to buy a m audio interface and went to a music equipment shop at my city (chennai , india)for enquiry two weeks before(i do not know about interface) the guy suggested me m audio fast track after 4 days he told me about m audio podcast which comes with a mic and adviced me to buy i was confused ! ! ! i asked about the podcast and fast track here and our revered guys adviced me to buy m audio fast track , not the podcast. then i contacted the shop owner and asked for the fast track he told me that he was having fast track pro only and fast track had to be ordered. he told me to wait and i am waiting (from last week) now he told me that m audio has released a new version of fast track interface which comes with pro tools and phantom power.which will reach him on the forth coming monday. i agreed to wait till monday. i searched the m audio site for the new version of fast track interface. i could not able to find it. kindly inform me the link . also tell me will it desirable to buy or shall i go for m audio fast track pro or some other else. (like personus, tascam) awaiting for your word