How do you put multiple tracks on one track with the Fostex mr-8?

Fostex mr8 multirack where can you find plastic key assembly StartStop ..Menu..etc plastic buttons?

I am confused. Is your question about buying replacement parts? If you want to know where you can buy the plastic buttons to replace broken ones, like Start, Stop, Record. You can buy them online at the Fostex store. It is under parts/accessories. Also, I recently replaced mine. I had to call them directly because their online store said they were out of stock. They are NOT out of stock. Unfortunately, they don't have good coordination with their online system; they had not updated their inventory records. You can find the number under "Contact us" on their website.