the iso should always be track 01 ,but it can be called what ever you like ,soniccd_01.iso
(( _01.iso )) is the important part and the audio mp3s should follow the same name.

soniccd_01.iso

the mp3 tracks should be named the same

soniccd_02.mp3
soniccd_03.mp3
and so on ….

when you have ripped your gamedisc ,iso and mp3 tracks ,nero will have numbered them for you, you should keep them in that order as thats the correct order the tracks play on the original disc,so you only need to rename your iso and mp3 tracks slightly but keep the track numbers.

this method is the exact same with sega saturn games and this is how pc emulators run megacd and saturn games.

you can use nero burning rom or any other program that lets you create an iso of a cd or dvd disc,but in the case of megacd and also sega saturn you should create an iso and also rip out the in game audio,nero does this nicely and i sugest you use nero.

in nero options ,choose nero burning rom,not nero express or smartstart,once the window has opened click on EXTRAS at top and choose SAVE TRACKS ,make sure your game disc is in the drive and it should load up showing you track 1 iso and then track 2 and track 3 and so on.

from here you can rip the iso file and the audio,you can rip the iso as nrg (nero iso format)
but you shouldnt choose nrg ,you want raw iso and for the audio tracks choose mp3.

once you highlight your iso or music track choose
the file type format to convert to,this is done through the output file format tab in the middle of the window,so if you have the iso highlighted you will be able to change the output format to iso or nrg,same with audio,mp3 or wav or whatever .

1,set frame rate to adjust (ability to set to 50 or 60 fps not dependant on bios.
2,scanline (makes fmv games and intros look much better.
3,overclock volume (i find this emu very quiet)
4,include more button setups to (better sync) can be mapped to a button (needed mostly for intros)

i really cant think of anything else this emu needs, its superb.

all working so far but roadrash seems very slow unless frameskip is on and also needs the sync fix
anyone playing sonic cd should use the usa iso as it runs much smoother than the pal 50 uk iso,if you dont like the us music just change it with uk music.

use program called (Media coder google it)

Just open it, set the ‘LAME MP3′ tab on the right to CBR, Stereo and somewhere from 96-128Kbps, go to the ‘audio’ tab on the left and set resample to 44100, set the output folder up top, hit ‘add’, choose all the mp3s, hit start and wait.

i got this information else where and had to sort some of my own mp3s out for segacd isos and this method works great.