Normed BPM

AGS_DEVOUT_DEFAULT_SCALE was introduced to limit BPM in ags_devout.h

#define AGS_DEVOUT_DEFAULT_SCALE (((AGS_DEVOUT_DEFAULT_BPM / 60.0) * (AGS_DEVOUT_DEFAULT_BPM / 60.0)) / ((60.0 / AGS_DEVOUT_DEFAULT_BPM) * (60.0 / AGS_DEVOUT_DEFAULT_BPM)))

120 BPM equals 2 beats per second for now. Previously you had rather 16 beats per 2 seconds. There will be a need for further work on Advanced Gtk+ Sequencer to enhance its reliability.