All 3 items were purchased open box, Is am selling as used.

K300 TUNING MASTER
8 Knobs: Independently adjust the microphone equalization(treble/mezzo/bass), microphone volume, voice changer volume, monitor volume, dodge speed.1 large knobs adjust reverb effect.

2 Track Control: Independently adjust the volume of the accompaniment music, record volume

4 Reverb Modes: You can freely choose 5 preset reverberation modes, no cycle through, just 1 key to start: KTV, Concert, Studio, MC.

4 Voice Changer: One-key to change multiple role voices to increase fun, Male/Female/Children/Warcraft voice

20 Atmosphere Special Effects: There are 20 atmosphere special effects for you to choose from, such as Laughter, Kiss, Debut.
sound effects board

16 pre-loaded sound effects + 3 DJ sound effects + 4 pitch changer
Multi-people and multi-devices simultaneous live streaming
Mixing, monitoring, and equalizer
K300 live sound card is exactly what you need when you want to get your podcast, radio shows. It is so easy and intuitive to use that you can jump headfirst into podcasting within minutes, and focus on providing valued content and interacting with your audiences rather than being distracted by the complicated operations.