IMPROVIS.stc found at kyv\2\MISC5.TRD of AAA collection mostly with Ironman and X-Raizor music
Broken source version of IMPROVIS.stc found at isaev_a_moscow\ISAY3\MUSIC\BADDISK.TRD of AAA collection
Good source of IMPROVIS.stc found at isaev_a_moscow\ISAY7\NUSIC\ROVERSOF.TRD
