Thanks for the help so far.. in the meantime I had a crash while saving and now the whole patch file crashes Max when I try to edit. Fortunately I have some earlier versions and the poly~s. But the calling up of buffers with "—" stopped working again.
I have attached the patch: The buffers are being populated in the top left corner. 2 poly~s down is a patcher called sample_select which should call up the right sound, but does so only when I’m editing in Max.