d-lusion Creator.
This product was actually the beginning of d-lusion (then called delusion sound systems) and dates back to 1991 when tracked music was getting popular on the PC. Creator was in fact one of the first multi-tracker programs for DOS with a fancy Turbo Pascal SAA GUI (4 Channels with 8 Bit/22Khz Samples were really state of the art at that time!). It was published as cheap Shareware (20 DM) and was registered over 1000 (!) times till the present day. Unfortunately, the program being in German did not earn international reputation. Additional features were: Fully mod compatible, Supports GUS, SBPRO, SB, DAC, Adlib, PC Speaker, Integrated sampling software, Sample manager and much more.
Potential interesting 3rd party stuff.