My LC520 has external scsi and running OS 7.6.1.

( At one time i had an external hard drive via scsi but that external drive and it's replacement had a horrible death. RIP dear drives. )

Would I be able to scsi a external CD burner, install Adaptec Toast and burn?

( i have a couple of external scsi CD burners and Adaptec Toast used by my Performa 6360 and Roland VS1680 hard disk recorder )