Electronic Keyboard Models & Demo Songs Database https://demodb.org/ Fri, 05 Jun 2026 10:43:14 +0000 FeedCreator 1.8 https://demodb.org/_media/logo.svg https://demodb.org/ https://demodb.org/en/roland/boss/dr-3?rev=1670322178&do=diff ROLAND BOSS DR-3 概览 ModelROLAND BOSS DR-3Year of Release2003Polyphony12-voicesDisplayYes, Backlit OrangePreset Patterns100 User, 100 PresetPads13Pads Respond to VelocityYesSound Generation MethodPCMMIDIMIDI InSound Expansion CapabilitiesnoOutputs anonymous@undisclosed.example.com (Anonymous) Tue, 06 Dec 2022 10:22:58 +0000 https://demodb.org/en/roland/boss/dr-220a?rev=1670322177&do=diff ROLAND BOSS DR-220A Overview ModelROLAND BOSS DR-220AYear of Release1986Rhythm Memory Capacity32 Preset, 32 UserSteps per Measure16 Steps / 12 StepsSongsMax 128 bars x 8 (Song Chain: 256 bars)Tempo40 bpm to 250 bpmDisplayYesMIDINoPower6V (UM-3 x 4) / AC adapter PSA-120, 220 or 240 (9V) anonymous@undisclosed.example.com (Anonymous) Tue, 06 Dec 2022 10:22:57 +0000 https://demodb.org/en/roland/boss/dr-550mkii?rev=1691598897&do=diff ROLAND BOSS DR-550 MkII The upgrade model of DR-550. Overview ModelROLAND BOSS DR-550 MkIIYear of Release1992Polyphony12-noteNumber of Drum Sounds91Display YesPreset Patterns 64 Preset and 64 UserSongs8 (Max of 160 Measures)Pads Twelve Pads Sound Generation Method anonymous@undisclosed.example.com (Anonymous) Wed, 09 Aug 2023 16:34:57 +0000 https://demodb.org/en/roland/boss/dr-770?rev=1668665431&do=diff ROLAND BOSS DR-770 [BOSS DR-770] Overview ModelROLAND BOSS DR-770Year of Release1999Polyphony14-voiceInstruments255Songs100DisplayYes, LCD non BacklitPreset Patterns400 Preset + 400 UserPadsSixteenPads Respond to VelocityYesSound generation methodPCMMIDIIn, Out anonymous@undisclosed.example.com (Anonymous) Thu, 17 Nov 2022 06:10:31 +0000