5 user reviews on ESI ESPe. Audio Interfaces · Internal Sound Boards · PCI/ISA + +. ESI ESPe. ESPe, PCI/ISA + Rack Soundcard from ESI. Full video review of the ESI ESP, one of the best value and most reliable PCI 8x8 audio interfaces. 25 user reviews on ESI ESP All user reviews for the ESI ESP . mixing and component-based vsti) ESP with this audio interface, which.