Original DX7 patches are notoriously glassy. Use a dynamic EQ or a smooth low-pass filter around 10kHz to take off the harsh digital edge. Add Chorus and Dimension
While not technically branded "DX7," many modern free libraries are designed around 4-op or 6-op FM synthesis. yamaha dx7 kontakt free
Elias clicked the link. A Google Drive window appeared. DX7_Collection_Free.nki. Original DX7 patches are notoriously glassy
Kontakt, however, is a sampler . It plays back audio recordings. yamaha dx7 kontakt free