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Roland | TR-55 |
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Description | The Roland Rhythm 55 (sometimes known by its model number, the Roland TR-55), is a preset drum machine (or "beatbox"), produced by Roland in 1972. It was one of a trio of drum machines released by Roland that year, offering features intermediate between those of Rhythm 33 (TR-33) and Rhythm 77 (TR-77). "TR" stands for "transistor rhythm". The Rhythm 55 had analogue voice circuits to produce its drum sounds, and offered approximately 20 permutations of preset rhythms. The Rhythm 55's drum voices are listed below. (They are the same as for the Rhythm 33.) The sounds are generated by analogue synthesis techniques, and, as is typical with this technology, the sounds themselves, although possessing a certain musical charm, are not particularly realistic imitations of their acoustic namesakes. The following voices are generated by "tuned resonance" type circuits: bass drum low conga high conga cow bell rim shot claves The following voices are generated by shaped white noise: snare drum hi hat maraca cymbal The only control on the front panel for adjusting the sounds is a balance control, which alters the relative levels of the bass drum and the cymbal/hi hat/maracas sounds. Rhythm Patterns The Rhythm 55 offers the user around 20 preset rhythms. There is no way to adjust the preset patterns per se, or to program your own patterns. The only control available is a (uncalibrated) knob to adjust the tempo, and a push-button which doubles the tempo. However, it is possible to select more than one rhythm at once, and also to effectively "mute" drum sounds from a pattern using the balance knob (see above), thus providing more possibility for rhythmic variation than might initially seem feasible. Main preset patterns: waltz slow rock ballad rock and roll beguine cha-cha mambo samba bossa nova rumba Additional "variation" patterns: "2 beat": bass drum bass & snare drum foxtrot 1 swing 1 march parade "4 beat": bass drum bass & snare drum foxtrot 2 swing 2 swing 3 tango Interfacing The Rhythm 55 can not interface with other instruments (e.g. to synchronize its tempo with another machine). The Rhythm 55 has a mono audio output, available on two unbalanced phone connector sockets—one socket is high impedance, the other low impedance. |
| Brand | Roland |
| Model | TR-55 |
| Device | Drum |
| Type | Desktop |
| Engine Type | Analog |
| Engine | VCO, preset |
| Voices (max) | 1 |
| Drums | Bass drum, low conga, high conga, cow bell, rim shot, claves, snare drum, hi hat, maraca, cymbal. |
| Keys | 0 |
| Key type | N/A |
| Velocity | N/A |
| Aftertouch | N/A |
| Produced: | 1972 |
| Legend: | Obvious | Y: Yes, N: No, N/A: Not Applicable | |
| VCO | Voltage Controlled Oscillator | DCO | Digital Controlled Oscillator |
| LFO | Low Frequency Oscillator | Sub | Sub Oscillator |
| VCF | Voltage Controlled Filter | VCA | Voltage Controlled Amplifier |
| Velocity | As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key. | Aftertouch | Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel. |
| Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise. | |||
