User manual DBX MODEL NX40

[. . . ] GROUNDING OR POLARIZATION: Precautions should be taken so that the grounding or polarization means of an appliance is not defeated. POWER CORD PROTECTION: Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance. SERVICING: To reduce the risk of fire or electric shock, the user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel. [. . . ] Hold from 0ms to 500ms: Hold sets the minimum gain reduction amount for a determined amount of time, after the the signal passes below the threshold. If the signal goes back above the threshold, the hold time is "restarted" and will hold the compressor at that amount of gain reduction for the set time, after the signal once again moves below the threshold. The Hold control is active when not in Auto mode (see Auto mode above). Release from 360dB/sec to 5dB/sec: The release control sets the speed at which the signal is returned to the normal signal after it has gone below the threshold, and the Hold time has been exceeded. The Release control is active when not in Auto mode (see Auto mode above). zzzz yyyy , , , , 16 |||| zzzz yyyyy , , , , , EDITING LIMITERS Figure 17: Limiter parameters and curve Digital Dynamics Processor Section 4: Editing / Saving / Recalling Programs Parameters of the Limiter The parameters included on the MODEL NX40 for limiting operations are as follows: MODEL NX40 Limiter output level Limiter threshold Off/on: Again, the limiter must be turned on to be able to change the parameters and affect the signal. Threshold control from -60dB to +4dB: As you move the threshold of the limiter up and down, you see the output level of the MODEL NX40 move in relation to the setting. This means that the limiter of the MODEL NX40 sets the absolute output level for the unit. Remember that very fast transient signals can occasionally "sneak" past the threshold control of any limiter. If you wish catch every single transient, set the TCM to a longer delay time, allowing the MODEL NX40 to begin to react to a transient signal faster. (For complete information on the TCMTM Transient Capture Mode controls, refer to the gate section on page 14 and 15, as well as appendix #1) Also note that the digital meters show when even 1 sample gets through the threshold. this can be disconcerting, given the fact that it appears that much more signal actually gets through the threshold. The effect is a broad, smoother EQ setting. The sidechain functions are convenient in many applications, such as broadcast engineering, where engineers are asked to provide "ducking" functions, as well as de-essing. Frequency-specific and sustain-related compression are also possible with the use of the sidechain functions of the MODEL NX40. See figure below for an illustration of the relationship of the sidechain path to the MODEL NX40's metering points. It is possible to separate certain vocals and instruments from a mix using frequency-weighted compression. With the 3-band parametric EQ in the sidechain path, the equalization settings do not shift the timbre or frequency response of the audio signal. They merely alter the threshold response of the processing section of the MODEL NX40 on a frequency-weighted basis. With this arrangement, raising certain frequencies on the equalizer causes them to be suppressed in the audio signal. A relatively high threshold setting can allow normal sounds to be unaffected while solo and very loud sounds are held back. (Of course, when compression does occur, the level of the entire program is affected. ) Depending on the threshold setting, lower level fundamentals or harmonics will not cause compression. During the recording of cymbals and tom-toms, a compressor with an equalizer in the sidechain path can help prevent tape saturation. The equalizer can be adjusted for boost with a peak of about 5kHz, causing the cymbal to be compressed on a very loud crash, stopping tape saturation at high frequencies, where there is less headroom. [. . . ] A software version number is imbedded in the data. Receive Key Scan Code (54h) SYS_HEAD, 54(h), cc, F7(h) cc Code for the Key Scan (note: there is only one byte, not two) The Receive Key Scan Code procedure is used to emulate a button press on the front panel of the MODEL NX40. The device will respond with a Receive Key Accepted procedure. zzzz yyyy , , , , 32 Key Next Select Prev Encoder up* Code 01h 05h 09h 0Dh Key Gate De-ess Prog Encoder down* Code 02h 06h 0Ah 0Eh Key Comp S/EQ Store Config** Code 03h 07h 0Bh 0Fh Key Lim Util Bypass Code 04h 08h 0Ch * Encoder controls are included, to allow you to emulate encoder moves as well as button presses. ** Config is included to make it accessible through SysEx commands even though it is not represented by its own button. |||| zzzz yyyyy , , , , , Section 6: Appendices Receive Key Accepted (56h) SYS_HEAD, 56(h), cc1, cc2, F7(h) cc Reset Program (20h) SYS_HEAD, 20(h), F7(h) Reset Device (21h) SYS_HEAD, 21(h), F7(h) Digital Dynamics Processor MODEL NX40 Code echoed for the Key Scan received. (00(h) if key is invalid) The Receive Key Accepted procedure is sent from the MODEL NX40 in response and acceptance of a Receive Scan Code Key or Receive Hold Scan Code Key procedure but is ignored if received by the MODEL NX40. The Reset Program procedure causes the MODEL NX40 to reload the current saved program. The Reset Device procedure causes the MODEL NX40 to reboot the software as if the power had been turned off, and then back on. [. . . ]