The Only other records that will play on a Diamond disc are 150 tpi Vertical cut Gennett records. I think though that these were designed for machines that use steel needles in the vertical position, these are thick blue label, and you can see that they have the same groove as a DD. I notice on these that the highs are clear just like Diamond Discs, so their is for certain a clarity issue in vertical over lateral. The Vertical recording also has superiority on a quantum level. Ever notice if you sit in front of your Damond Disc, or a cylinder recording with the machine well adjusted, that if you can close your eyes You can place the instruments in the studio, in a 3 dimensional plane, even though it is supposedly a MONO system. This will, however NOT be present if you play these records back electrially. When we trasferred the cylinder records to the sound track for the Bolden movie, We used the Edison C reproducer, 56" horn and 3 microphones, as opposed to an electrical pickup, 2 Schoeps and 1 Neumann U-87 were used. We did about 3 or 4 takes with different microphone positions, and the result was a surprising surround sound spread, _________________________________________________________________ More immediate than e-mail? Get instant access with Windows Live Messenger. http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refresh_instantaccess_042008