Trap: a half-time beat, rolling hats, a gliding 808 and a dark bell melody

Take the loop apart

Press Play and let the eight bars loop. Each row is one track of an Ensemble Set: Drums on T1, 808 on T2, Bell on T3 and Strings on T4. All four parts are original MIDI written for this lesson, played live in your browser by the Ensemble instrument, so every sound comes from a device you can open and change.

The loop builds tension for seven bars, then bar 8 drops out: after beat 2 the kick, the 808 and the strings stop and only a snare roll is left, so bar 1 hits hard when everything comes back. Solo and mute the parts as you read; the 808 needs headphones or good speakers. Edit sound opens a part's Ensemble editor on this page: turn a knob while the loop plays, or play the keys while it is stopped. Reload the page to get the lesson's settings back.

1. Half time, and hats that do the drumming

Solo Drums and listen to the kick and the clap first. The clap lands once a bar, on beat 3, and the kick plays beat 1 and the “and” of 3 (in the even bars also the last sixteenth of beat 2). The tempo is 140, but if you nod on the clap you are moving at 70: that is the half-time feel. No kick ever lands on the clap, which is the anchor of the groove and never played softly.

Now listen to the hats, the busiest part of the beat. In bars 1, 3, 5 and 7 they play eighths at alternating loud and softer velocities, then speed up to sixteenths at the end of the bar. An open hat on the “and” of 2 rings for an eighth until the closed hat on beat 3 cuts it off (the Drum engine chokes a ringing open hat when a closed hat plays), so the sixteenth right after it stays empty. In bars 2, 4 and 6 the hats leave the grid: eighths over the first two beats, sixteenth-note triplets over beat 3 and a roll of eight 32nd notes over beat 4, rising from velocity 50 to 100 so the roll sounds like it climbs.

Bar 8 is the fill: one kick on the downbeat, the clap on 3, eighth hats until the “and” of 3, then a snare roll up the last four sixteenths (velocities 70, 85, 100, 120). Everything here is straight: trap does not swing its sixteenths. The groove comes from the hats changing speed, the way a rapper switches flows.

2. The 808 is the bass

Add 808 and listen to it with the kick. Every 808 note that starts together with a kick is a hit: the kick gives the click, the 808 gives the long, booming tone. The notes that start without a kick are slides. The 808 is set to legato with glide, so when a new note starts while the previous one is still held, the pitch bends up or down to it instead of starting again. Bar 1 slides from F1 up a fifth to C2, bar 2 up an octave to F2, bar 3 from D♭2 down to A♭1, bar 4 down a half step to C2, bar 5 from B♭1 up to D♭2, bar 6 up to C2 and bar 7 from C2 down to G1.

Because legato with glide slides every pair of notes that touch, only the slide notes overlap the note before them; every other note ends before the next one starts. Each slide also stops a 32nd before the bar line, so the 808 starts each new bar fresh with the kick instead of gliding into it. In bar 8 the 808 holds C2 for two beats and then drops out with the kick. Never play two 808 notes at once: it is a single, monophonic voice.

3. Four chords, two bars each

The chords change only every two bars, a slow harmonic rhythm typical of trap. The strings hold each one, and the 808 and the bell outline it:

• Bars 1–4: i – i – VI – VI (F minor – F minor – D♭ major – D♭ major)
• Bars 5–8: iv – iv – V – V (B♭ minor – B♭ minor – C major – C major)

Roman numerals name each chord by the scale step it is built on: lower case for minor, upper case for major. F minor, D♭ and B♭ minor all come from the F natural minor scale. The C major chord borrows E natural from F harmonic minor, which raises the seventh step: that makes the V chord sound like a threat that wants to resolve back to F minor.

Trap beats often loop two to four chords for a whole song, and many sit on one dark minor chord. The strings voice every chord close to F3, so the pad barely moves while the harmony changes underneath the melody.

4. A bell melody that asks and answers

Add Bell. The melody works in two-bar pairs: a busy first bar of eighth notes that starts off the beat, like a question, then a second bar with one long note and a short falling answer. Each pair follows its chord: C, A♭ and F over F minor, A♭ and D♭ over D♭, D♭, B♭ and F over B♭ minor. It stays between E4 and F5 and uses only notes of F minor, except in bar 7.

Over the C chord in bar 7 the bell plays E natural and then D♭: the raised seventh against the flat sixth, the sound of F harmonic minor. Bar 8 just holds C5 for two beats and goes quiet with the drop-out. One melody is enough in trap; the beat is built to leave space for a vocal.

5. The sounds

Each part starts from an Ensemble factory sound with values changed for this arrangement. Edit sound shows every one, and the same project opens in the DAW. A value written as 40/127 is the knob's stored number on a 0–127 scale; the editor's display may show it converted, for example as a percentage or a time.

Drums (T1): the Drum engine

DRUM KIT on the Drum engine, switched to the kit labelled 80 (stored as 4), an 808-style kit. TONE is raised to 75/127 for bright hats, DECY lowered to 45/127 for a short clap and tight hats, SNAP raised to 90/127 and ACC to 110/127; KICK stays on PUNCH, a short kick, because the 808 carries the boom. DRV 20/127 and DST 10/127 add grit. Notes follow the General MIDI drum map: 36 kick, 38 snare, 39 clap, 42 closed hat, 46 open hat. A REV send of 12/127 gives the clap a short tail.

808 (T2): Duo, a gliding sine

The 808 starts from SUB BASS on the Duo engine: WAVE SIN with DTN 0 and MIX 0/127, so it is one clean sine. CUT is opened to 110/127 with RES 0/127, DRV 55/127 and a DST of 50/127 add the harmonics that make it audible on small speakers, and KTR is 64/127. The envelope is ATK 0/127, DEC 110/127, SUS 100/127, REL 30/127: an instant start and a long ring. VCE is LEG with GLMOD TIME and GLD 35/127, so overlapping notes slide; a fifth takes about 70 ms, the octave in bar 2 about 140 ms. Many 808 patches add a pitch envelope for punch. Here ENV to PIT stays at 0, because the Ensemble envelope holds at its sustain level: a PIT of +10 would keep every note about one and a half semitones sharp. The sends stay at zero, so the 808 is dry and centred.

Strings (T4): Trio, a detuned saw pad

Strings starts from CHIP CHOIR on the Trio engine and becomes a string section: WAVE SAW3 (three saws), INT2 and INT3 at 0 so all three play the same note, DTN 20 (cents) so they drift against each other like an ensemble, and a low-pass at CUT 55/127 with RES 10/127. The filter envelope is turned off (FLT 0), the envelope is ATK 70/127, DEC 90/127, SUS 100/127, REL 80/127 for a slow swell, and the sends are CHO 30/127 and REV 70/127. Its level is the lowest of the four parts: mute it and the beat turns cold, unmute it and it sounds cinematic.

Bell (T3): Digital, an FM bell

Bell starts from BELL on the Digital engine, a four-operator FM synth. ALG is set to 1 (stored 0), a chain where each operator modulates the next, and R2 to a ratio of 11, so the modulator runs eleven times faster than the note and adds high, glassy overtones. IDX 70/127 sets how bright the strike is, MDEC 50/127 lets that brightness fade like a struck bell, and FB 10/127 adds a little edge. The envelope is ATK 0/127, DEC 80/127, SUS 20/127, REL 60/127. Sends: CHO 20/127, DLY 40/127 and REV 45/127.

6. Making room for the 808

In trap the 808 and the vocal are the loudest things in the mix. Here the 808 sits at LVL 96/127 and is still the heaviest part, the drums are at 108/127, the bell at 112/127 and the strings well under them at 92/127. The kick and the 808 share every hit, so the kick is short and the 808 starts with it; the bell and the strings stay above the 808's range. A finished trap master would add a Glue Compressor, a high-pass around 25 Hz and a limiter for a very loud result; the Ensemble Set's master has only MASTER and LOWCUT, so those are left out here.

The shared delay repeats in quarter notes (1/4) with FDBK 40 on its 0–120 scale, COLR 40/127 and MIX 90/127, and mostly carries the bell. The reverb is a HALL with SIZE 90/127 and DAMP 60/127, fed by the strings and the bell; the chorus runs slowly (CRT 30/127, CDP 50/127). On the master, LOWCUT stays OFF, because its cut would thin out the 808, and MASTER is lowered to 112/127 for headroom.

Try this in the DAW

Open in the DAW loads this exact project into the browser studio, with the Bell track selected, armed and open in its Ensemble editor: play the on-screen keys or your computer keyboard to try your own melody over the loop. Then try these three changes:

1. Glide time: on T2 set GLD from 35/127 to 10/127, then to 80/127. A short glide is a quick bloop, a long one a lazy dive. Then shorten the F1 on the “and” of 3 in bar 1 to an eighth note, so it ends before the C2 starts: the slide disappears and the C2 becomes a new hit.
2. Roll speed: in bar 2, replace the 32nd-note roll over beat 4 with sixteenth-note triplets (six hats, a sixth of a beat apart, like the ones over beat 3). Same beat, a different flow.
3. Dirty versus clean 808: play the loop on laptop or phone speakers and sweep T2's DST from 0/127 to 100/127. Without drive the 808 nearly vanishes on small speakers; with it the harmonics carry the bassline.

Your edits stay in that temporary project. They do not change this page.