Fig. 2-3. 11-Byte Direct MIDI SysEx String

SysEx Start

Aphex MIDI I.D.

MIDI Channel

MIDI Device

Net Number

Command

Mic Channel

Value

SysEx End

F0 00 00 38 xx xx xx xx xx xx F7

(00h to 0Fh) Offset by -1 from 1788A Channel #

(00h to 0Fh) Offset by -1 from 1788A Device #.

(00h to 0Fh) Offset by -1 from 1788A Net #

See Table Mic Channel (01-08)

See Table

2.1.4 Understanding Ch, Dev and Net Offsets

Please observe two important facts about MIDI Channel, Device, and Net Numbers.

1.All three are displayed in decimal form on the 1788A and 1788A-R front panels. Ch and Dev go from 01 to 16 and Net goes from 001 to 128. You will need to convert decimal to hexadecimal for use in SysEx strings. A handy conversion table is located in this chapter’s reference data.

2.Channel, Device, and Net numbers in the SysEx strings must be programmed with an offset of -1from the numbers that are indicated on the 1788A’s front panel readout. For example, if the 1788A is set to Ch 01, Dev 02, and Net 003, the SysEx code would look like

0001 02, not 01 02 03. This may be confusing at first, but you will find it quickly becomes easy to deal with.

2.1.5Setting Up The Controller

The method of programming a MIDI control varies from product to product. To successfully interface a MIDI control surface to 1788A’s, you will need to learn the control surface. Once you have determined the way to program your controller, you can begin applying SysEx strings to the controls. We will next illustrate this process by using a general purpose MIDI controller, the Peavey PC 1600x. You can apply what you learn to any other MIDI controller with appropriate variations.

Here’s how we’re going to set it up. The MIDI controller will be set up to control the Input Gains of all eight channels of a 1788A. The pushbuttons under each fader will be programmed to activate/deactivate the Mutes of each channel.

Fig. 2-4. Example of MIDI R/C Unit

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Aphex Systems 1788a instruction manual Understanding Ch, Dev and Net Offsets, Setting Up The Controller
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1788a specifications

Aphex Systems 1788A is a high-performance microphone preamp and A/D converter known for its exceptional sound quality and versatility. This device is widely used in professional recording studios, broadcast facilities, and live sound applications, catering to a range of audio needs from vocals to instruments.

One of the key features of the 1788A is its ability to handle a wide variety of microphone types, including dynamic, condenser, and ribbon microphones. It provides a significant amount of gain, with a range of up to 70dB, allowing it to capture even the faintest of sounds without introducing noise. The flexibility of input options is enhanced by phantom power, which can be activated for condenser mics needing external power.

The Aphex 1788A also integrates advanced A/D conversion technology, providing high-resolution 24-bit audio with sample rates up to 192 kHz. This ensures that audio fidelity is maintained during the recording process. The unit features a dual-path A/D converter, which optimizes the signal for clarity and precision.

The device also incorporates Aphex’s innovative iEqualization processing, allowing users to enhance their recordings with EQ capabilities in real time. The iEqualization feature is particularly beneficial for adjusting the tonal characteristics of the source material, providing a more polished final product.

Another standout characteristic of the Aphex 1788A is its robust build quality. Designed for the rigors of professional use, the unit is housed in a rugged chassis that can withstand the demands of mobile and studio environments alike.

Transporting this device is made easier due to its rack-mountable design, fitting seamlessly into any standard 19-inch rack setup. Additionally, users appreciate the intuitive front-panel controls that facilitate easy adjustments and monitoring of levels.

In terms of connectivity, the 1788A offers multiple outputs, including analog XLR and digital outputs via AES/EBU and S/PDIF connections, making it highly compatible with various audio interfaces and recording systems.

Overall, the Aphex Systems 1788A is a powerful tool that combines exceptional preamp performance with high-quality A/D conversion, making it an ideal choice for audio professionals seeking reliability and superior sound quality in their recordings. Its comprehensive feature set ensures it meets the demands of both studio and live environments, solidifying its reputation as a trusted piece of audio equipment.
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