The Zoom RhythmTrak RT-123 has only one MIDI port, which is a limitation compared to the Alesis SR16's more comprehensive MIDI connectivity.

The RT-123 requires sending a "Program Change" message to switch kits when used as a sound module, which some controllers like the Arturia Keystep Pro may not support directly.

The RT-123 can receive start messages from controllers like the Keystep Pro and maintain the assigned kit if the clock is set to internal.

The RT-123 allows bass parts to be played over MIDI on a different channel than the drums, surprising some users with its versatility.

Users appreciate the ability to make custom kits, utilizing three drum tracks and one bass track for personalized sound creation.

The Alesis SR16 is noted for having dated sounds that aren't quite vintage or modern, whereas the Zoom's sound quality is a point of concern for users considering a trade.

Some users prefer the RT-123 over Boss and Alesis drum machines for its sequencer and real-time recording slider, despite its lack of MIDI out.

The Alesis SR16's MIDI in, out, and thru capabilities are beneficial for users integrating it with DAWs like Ableton Live, enhancing sequencing flexibility.

A workaround involves converting MIDI CC messages to Program Change messages using a computer or standalone MIDI processing box like BOMEbox or MIDIHub.

Users find value in using the SR16 as a clock source for sequencing other gear like the Volca Keys and Volca FM, showcasing its versatility in a hybrid setup.

The RT-123's dual drum tracks allow assigning different kits to each track, enabling kit switching by altering the MIDI channel.

The RT-123's sounds, while considered cheesy, can be creatively pitched to shine in certain musical contexts, making it suitable for unique jamming sessions.

The RT-123 features velocity-sensitive pads, providing more dynamic control than typically expected at its price point.

Owners have found the RT-123 second-hand at surprisingly low prices, such as £12, highlighting its affordability for a capable drum machine.