To find the buffer size (current buffer size : 2048)

[designe]

Current Modulation Method : FSK

Current Buffer Size : 2048
Current SampleRate : 44100
2048 / 44100 : About 0.046439...

It means that data transmission speed is almost 400(25 * 16) bit/s.
So, this issue is going to find the minimum value of buffer size. it is same with speeding up.