User`s manual

2.4 Warm-Up and General Tuning
As with all other true analog synthesizers, after being powered-on the MiniBrute
needs a warm-up period of approximately five to ten minutes. The allows reaching
a stable operating temperature, which insures accurate oscillator pitch. Warm-up
time depends on the external temperature; a colder ambiance will require longer
warm-up times, while a hotter ambiance will result in shorter times.
Once the synthesizer has reached its running temperature, tune it to pitch. Use an
external tuner to check the instrument’s tuning; if needed, tweak the Fine Tune
knob to tune the MiniBrute to the desired pitch.
The MiniBrute has been designed for rock-solid pitch stability when operated in
normal temperature and humidity conditions, at external temperatures between
20°C and 32°C in temperate areas. In practice, the MiniBrute provides satisfactory
operation over a much wider temperature range, although extreme external
temperatures or fluctuations can lead to longer stabilization time or erratic tuning.
Arturia MiniBrute SE User's Manual 13 2 Installation