Turntables, sequencers and samplers are sometimes included. VST Instruments can act as standalone software synthesizers, samplers, or drum machines. VST instruments include software simulation emulations of well-known hardware synthesizers and samplers. Poe began experimenting with musical samplers and sequencers as a teenager. Sound chips normally contain things like oscillators, envelope controllers, samplers, filters and amplifiers. They also use samplers and an MPC2000 sequencer. The advent of affordable samplers such as the Akai MPC (1988) made looping easier. They are usually integrated using hardware (samplers) or software such as digital audio workstations. With this the duo invested in a collection of Akai S1000 samplers and other equipment. Playing most of the keyboards, drum machines, guitars, and samplers himself, he recorded a demo. Early incarnations of the band featured three people playing guitar, drums, keyboards, and samplers. It was followed by competing samplers from companies including Korg, Roland and Casio. This concept is similar to the handling of sample banks in digital samplers. EPs tended to be album samplers or collections of singles. Lee has also made use of digital samplers.