(@4:40) "and then from there I got a TR-909 Drum Machine"

The RZA talks about his history with drum machines and such in this video at 2:50, including the 909 machine "...My Dj Scotty Rock gave me my first 909 drum machine..."

Roland TR-909 Rhythm Composer The Roland TR-909 Rhythm Composer is a partially analog, partially sample-based, drum machine introduced by the Japanese Roland Corporation in 1983. The brainchild of Tadao Kikumoto, the engineer behind the Roland TB-303, it features a 16-step step sequencer and a drum kit that aimed for realism and cost-effectiveness. It is fully programmable, and like its predecessor, the TR-808, it can store entire songs with multiple sections, as opposed to simply storing patterns. It was the first MIDI-equipped drum machine. Around 10,000 units were produced.

All drums except for the hi-hats and cymbals are synthetically generated; there is an oscillator circuit with a dedicated filter and envelope curve. The hi-hats and cymbals are 6-bit samples, compressed and combined with a volume envelope curve (and tuning) to allow slight modification. Thanks to the analog circuitry, various aspects of the drum sound can be modified (pitch, attack, decay).

There is also a feature called "accent"—a primitive means of humanizing the drumbeat. In a simplified model of a drummer and a kit, the loudness of the sound created would basically depend on the velocity at which the drummer hits a given part of the kit. A human drummer can emphasize certain notes by playing them louder, and the accent parameter provides a means to boost a particular step.

Part of the charm of the TR-909 comes from its 16-step sequencer — the 16 buttons along the bottom of the interface correspond to the 16th notes of a single bar in 4/4 meter. For example, punching the buttons 1, 5, 9 and 13 on the bass drum part would create a simple "four to the floor" beat. Multiple patterns can be grouped or chained together which allows the user to create drum patterns that are longer than one bar in length or, alternatively, create drum patterns in compound meters outside of 3/4 or 4/4. While the sequencer is running, a light runs from step 1 to step 16.

This machine is used most of the common dance tracks and you can almost say that this is the standard House and Techno beatbox. Used:

Almost in every Experience track! like... Everybody in the Place Wind It Up

This machine can been seen in many Prodigy Experience videos and sometimes Liam uses it in live shows.

In the YouTube video "Drum Computers - Studio Time: S2E2," Junkie XL demonstrates his use of the Roland TR-909 Rhythm Composer, highlighting its fun and engaging features.

at 3:40 the TR-909 can be seen behind Scott

In a video shared on his official Instagram account, Jeff Mills is seen using the Roland TR-909 Rhythm Composer.

In this post, KiNK can be seen playing Roland TR-909. Through his Instagram posts, he seems to use the TR-909 frequently in the studio.

"Basically everything we’ve used we practically still have here. So it’s a list too long to go into. There is a wall alone that is the orginal setup of Skinny Puppy, based around a pair of Roland TR-808’s, Roland TR-909 with trigs going to many differnat devices including Sequential Circuits Pro One, Roland System 100m, ElectroComp Eml 101, Korg SQ-10, Korg MS-20, Korg MS-10, ARP 2500 and ARP 2600."

In this user-uploaded photo, Thomas Bangalter is seen with a Roland TR-909 Rhythm Composer, a key piece of gear in his production setup.

In this article, Joris says, “When I started, techno was still pretty big, so I decided that I needed to have a 909. I bought the 808 as well, but the 909 has a much tougher sound on the floor. I don’t use it much now - apart from the odd sample here and there.”

In the 2002 YouTube video "Recording Studios Presentations | ATB Music Production & Recording Studio," ATB is shown using the Roland TR-909 Rhythm Composer in his main studio.

From about 14 seconds you get the best view of Bicep using the Roland-909 in this video on their Facbook.