The M-64C has the same design as the M-16C except that the M-64C has 4 times the memory of the 16. The JX-8P can store 32 user patches on an M-16C. The JX-8P can also store 32 user patches on an M-64C, it just ignores the additional memory addresses. The JX-10 and MKS-70, having a number of parameters not found in the JX-8P, require more memory and use the M-64C. However, the JX-10 and MKS-70 can read/import JX-8P patches that have been stored from a JX-8P onto an M-16C