Alesis SR-18 drum machine didn’t claim to be "revolutionary", but justified the good name of its predecessor - SR-16. The number of audio samples and presets was increased, as well as the 24 bit resolution was implemented. Its body is completely made of plastic, but at the same time it is quite heavy and durable.
Most controls are similar to those intrinsic to a typical drum machine: step editing, roll, fill, tap, etc. Creating, editing and organizing patterns is a very simple thing to do, though step editing is somewhat inconvenient compering to modern programming techniques.
SR-18 has a large number of drums and a lot of preset patterns. All drums can be altered by introducing some changes into the envelope and pitch.
The drum voices are of good quality, free from any overt digital influence, and the range of tones is certainly improved comparing to previous models. Acoustic samples of drums are often "sticky" in drum machines, but there are high-quality sounds, especially among percussions.
While the original SR16 offers just 1 drum kit for programming, SR18 is expanded offering percussion and bass. These 2 additional sets can be programmed the same way the drums can be. Percussion introduces 102 sounds, and bass - 50. Besides pitch, filter and envelopes for each drum sound, sound processing includes 22 reverb presets and 14 equalization/compression presets.
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