WAce Tone
WARP Instruments
WBehringer
WBuchla Electronic Musical Instruments
WCasio
WClavia
WCrumar
WGeneralmusic
WJoMoX
WKorg
WMusical Instrument Factory of Riga
WNovation Digital Music Systems
WPalm Products GmbH
WQuasimidi
WSeiko
WSiel
WTeenage Engineering
WWaldorf Music
WYamaha Corporation