With DBX and BSS DSPs, you are controlling an object in the DSP such as a fader, gain, n-gain etc. The control of the gain for example requires you to have some logic to send commands at the db level to raise and lower the object in the device.

So, for example, if you wanted have a raise gain button and a lower gain button, you would have to have a way to increment and decrement the level by db amount and send that level to the gain after each increment or decrement. Your control system would have to be capable of formulating an analog ramp function.

There is no one code for volume up, like hex VOLUP. I don't have the protocol handy, but an example would be you send VOLUP1d, VOLUP2d, VOLUP3d over time while the button is held.

I'm sure I'm clear as mud, but I tried.

A side note: You need to know the Object ID to formulate the string. ctl-shift-o on the object in the Zonepro software will show you that id if i remember correctly.

I pulled up the doc. Here is an example of what I'm getting at.

/* UCHAR m20dB[] */
{0xF0, 0x64, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1C, 0x0, 0x33, 0x1, 0x5, 0x0, 0x10, 0x0, 0x30, 0x1, 0x5, 0x0, 0x10, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x1, 0x3, 0x0, 0x0F, 0x8D},

/* UCHAR m18dB[] */
{0xF0, 0x64, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1C, 0x0, 0x33, 0x1, 0x5, 0x0, 0x10, 0x0, 0x30, 0x1, 0x5, 0x0, 0x10, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x1, 0x3, 0x0, 0x23, 0xD },

/* UCHAR m16dB[] */
{0xF0, 0x64, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1C, 0x0, 0x33, 0x1, 0x5, 0x0, 0x10, 0x0, 0x30, 0x1, 0x5, 0x0, 0x10, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x1, 0x3, 0x0, 0x37, 0xF1},