What is a Breath Controller and how does it work?
A Breath Controller is a device which converts human breath pressure into electrical signals so that the keyboard is able to detect them. The musician must blow into the mouthpiece while he is fingering a note on keyboard at the same time and the breath controller must be plugged into a device which has a  breath controller jack. By connecting the headset to a breath controller jack on MIDI box, the player can control MIDI breath control data according to how hard or soft he blows into the mouthpiece. Musicians will add emotion and sense to their keyboard sounds and produce a more expressive music by using a breath controller. Moreover It is also possible to use signals sent by the breath controller with the aim of controlling other devices such as MIDI synthesizers, MIDI sequencers, MIDI lighting systems, etc..
Can I use Yamaha dx7 directly with MRTaudio Breath Controller Headset without a MIDI converter?
No, MRTaudio Breath Controller Headset works only with MIDI box (converter).
Can I use MIDI box with cubase on computer  through a USB input without a MIDI output? 
No, USB input can only be used as a power source. USB inputs found as a standard in many devices are in fact designed only for convenience.
Is it possible to use MRTaudio Breath Conttroller with Korg Kronos?
Yes. Indeed it is possible to use MRTaudio Breath Conttroller with any device with a MIDI input. Since it sends standard MIDI CC7 signals, all keyboards work problem-free if necessary adjustments are done.
Why do sounds become zero when I go from one sound to another on my Korg pa 800 keyboard?
The reason for this problem is not adjusting offset settings as zero.
Does the headset work through a microphone?
No, the headset does not work with the help of a microphone. Actually MRTaudio Breath Controller does not include a microphone or any audio equipment. The misunderstanding is caused by the company’s name, that is MRTaudio. Our headset works with a new generation pressure sensor which has an output voltage of 0 -5 V and this voltage is converted into digital one through analogue to digital converters. Then these digital signals are processed and converted into MIDI signals.
Is it possible to use MRTaudio Breath Controller on computer?
Yes, you can use it on your computer if your sound card has a MIDI-in input. In case your sound card does not include a MIDI-in input, you can always buy a MIDI to USB converters for very cheap prices ($10-15).