A digital synthesizer is a synthesizer that uses digital signal processing (DSP) techniques to make musical sounds. This in contrast to older analog synthesizers which produce music using analog electronics and samplers which play back digital recordings of acoustic, electric or electronic instruments.
 Bandcamp is a privately held company founded in 2007. Providing an online music store launched in 2008, as well as a platform for artist promotion, that caters mainly to independent artists.Artists who use Bandcamp are provided with a customizable microsite where the music they create can be uploaded and shared. All tracks can be played for free on the website and users are most often provided with the option to purchase the album or a specific track at customizable prices, and sometimes are given the option to pay more than required for the album/track.
 PayPal Holdings, Inc. is an American company operating a worldwide online payments system. Online money transfers serve as electronic alternatives to traditional paper methods like checks and money orders. PayPal is one of the world's largest Internet payment companies. The company operates as an acquirer, performing payment processing for online vendors, auction sites and other commercial users, for which it charges a fee.