In addition to customized spoken altitude/speed/temperature announcements in each phase of a skydive as well as optional pre- and post-jump briefs, SonoAlti G2V also contains 83 pre-recorded notifications in crystal clear CD-quality audio. These notifications will override any regular altitude/speed/temperature announcements when they are included in a preset. Users may create their own notifications as well, as long as the sound files are in the same format (mono 16-bit 44.1 kHz PCM); see the manual for instructions.

The sounds could be grouped roughly into categories as follows. A red check (✓) indicates that a notification is one of the defaults (default settings are on Preset 1 on a new altimeter).

SonoAlti G2, SonoAlti G2V, and ColorAlti G2 share 32 different types of piezo audible alarms that can be used in any phase of a skydive. Although one can use any alarm one wishes, certain alarms (those higher-pitched ones) are intended to be freefall alarms and others are intended for canopy or ascent because of their acoustic characteristics. In the table below, a check indicates which alarms were originally intended for what purpose; a red check (✓) indicates that an alarm is one of the default alarms (default settings are on Preset 1 on a new altimeter). The examples given use the default alarm center frequency of 4.0 kHz.

SonoAlti G2, SonoAlti G2V, and ColorAlti G2 also have a number of internally used sounds that indicate various states of the altimeter. The following table shows these sounds and how they are activated.