ACMT - Applied Computer Music Technologies Ltd

ACM-5A Product Operating Guide
 
Access to plug-in parameters is provided by a fully resizable graphical user interface. Your host application may also provide access to parameter adjustments and additional configuration. Graphical User Interface
 
The plug-in settings are adjusted by clicking and dragging on the rotary controls or buttons. Some controls may have detents – these manifest themselves as areas in the rotation where the reluctance to move is increased such that you have to drag them a bit harder. They are intended to behave similarly to real controls which may have a 'click stop' at 0dB for example.
 
You can also adjust the controls by placing the mouse pointer over them and using the scroll wheel. In this case the detent has no effect.
 
Control Modes
 
The control mode determines the way in which the rotary controls respond to mouse movement. This can normally be configured via the host application preferences. Please refer to your host application documentation for details.

• Circular. In this mode, clicking on a control will move it immediately to the mouse pointer’s angular position. To adjust the control, drag the mouse pointer in a circle or an arc.
• Relative Circular (Default). This is the default mode unless changed by host application settings. Similar to circular mode, however moving the mouse will adjust the control relative to its current setting.
• Linear. In this mode, the control responds to vertical mouse movement. Drag up to increase the value, turning the control clockwise, or down to decrease the value, turning the control anticlockwise.

In all modes, double clicking the centre of a control will return it to its default position.
 

Control Functions
 
1. EQ In
 
This is the EQ filter bypass switch. With the switch on, the filters will be in the signal path and affecting the output. With the switch off, the filters will be out of the signal path.
 
Note that vintage hardware EQs such as the original Pultec units often had passive filters, followed by a transformer-coupled valve (tube) amplifier stage to make up for signal loss in the filter. Even with the filters bypassed, the amplifier stage remained in circuit. While this does not affect the signal level, it does mean that there is still extra valve 'warmth' even with the EQ switched out.
 
2. LF Peak Frequency
 
The low-peak frequency (CPS) control selects the centre frequency for the low-peak filter. The switch has five positions and in keeping with similar vintage hardware, the control settings are indicated in cycles per second (CPS) - equivalent to Hz.
 
3. LF Peak Boost
 
Next to the low-peak frequency selector is the low-peak boost control. This determines the amount by which the low-peak filter boosts the selected frequency. The scale does not indicate dBs directly, though at some points it may align with the equivalent dB boost.
 
4. Mid Dip Frequency
 
The mid frequency switch (KCS) selects the centre frequency for the mid-range dip (cut) filter. The switch has eleven positions, and in keeping with similar vintage hardware, the control settings are indicated in KCS (kilocycles per second) or kHz.
 
5. Mid-Range Dip
 
The mid-range filter provides a cut or dip in the response at the selected frequency. It is not possible to boost the mid range with this EQ. Instead, the amount by which the selected frequency is attenuated, or cut, is determined by the dip control.
 
6. HF Peak Frequency
 
Similar to the low frequency section, the high-peak filter consists of a frequency selector and a boost control. The selector switch has five positions indicated in KCS [kilocycles per second] or kHz.
 
7. HF Peak Boost
 
Next to the high frequency selector switch is the high frequency boost control. Similar to the low frequency peak, this determines the amount by which the high-peak filter boosts the selected frequency. The scale does not indicate dBs directly, though at some points it may align with the equivalent dB boost.
 
8. Power Switch
 
The power switch provides a 'clean bypass'. With the switch off, the EQ and the tube amplifier emulation will be completely out of circuit and signals will pass through unaffected. With the switch on, the EQ will operate normally, where the tube amplifier emulation remains in the signal path even when the EQ filters are bypassed ('EQ In' switch [1] set to off).

ACM-5A Technical Specification:
 
1. System Requirements (64bit Linux)

• Linux x86-64/AMD64 64bit e.g. Ubuntu 20.04 LTS or newer.
• A Linux VST or VST3 compatible host application.

2. Product Specifications

• Linux VST and VST3 compatible.
• Mono or stereo operation.
• Interpolated controls for smooth parameter changes with no 'zipper' noise.
• -18dBFS reference level for 0dBu.
• THD: 0.15% at +10dBu.
• LF Peak - Max. Boost: 11.5dB dependent on control interaction.
• Mid-Range Dip - Max. Cut: 10dB dependent on control interaction.
• HF Peak - Max. Boost: 9dB Dependent on control interaction.
• Filter types:
  • Low frequency peak (boost).
  • Mid frequency dip (cut).
  • High frequency peak (boost).
• Filter frequency ranges:
  • Low Peak: 200Hz, 300Hz, 500Hz, 700Hz and 1000Hz.
  • Mid-Range Dip: 0.2kHz, 0.3kHz, 0.5kHz, 0.7kHz, 1kHz, 1.5kHz, 2kHz, 3kHz, 4kHz, 5kHz and 7kHz.
  • HF Peak: 1.5kHz, 2kHz, 3kHz, 4kHz and 5kHz.
• Polarity invert switch.
• Output level trim (+/-6dB).

Please note: In the interest of continual product improvement, specifications may be subject to change without notice.

ACM-5A Download Free Demo
 
1. System Requirements (64bit Linux)

• Linux x86-64/AMD64 64bit e.g. Ubuntu 20.04 LTS or newer.
• A Linux VST or VST3 compatible host application.

2. Free Demo Limitations

• Every 60 seconds the plug-in will fade to silence momentarily. To remove this limitation you will need to have purchased a product activation code.
• To remove the demo limitations, open the plug-in in your host application and click the lock button at the top left of the plug-in GUI to open the license entry dialogue. Type (or paste) your product activation code into the text box. You will then need to restart your host application to complete the process.

3. Product Support

• All downloads include their own installer, manual, and installation instructions. Easy to install with just a few clicks.
• If you need help downloading or installing the software please use our contact form to let us know.