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WT-QUAD LFO
User Manual
for firmware 2.5.1
Last edited March 14, 2025
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Summary of Contents for ACL WT-QUAD LFO

  • Page 1 WT-QUAD LFO User Manual for firmware 2.5.1 Last edited March 14, 2025...
  • Page 2: Table Of Contents

    Table of Contents Table of Contents ....................2 Introduction ......................4 Key Features ......................4 Technical Specifications ..................4 Getting Started ....................5 Installation ......................5 Basic Operation ....................5 Display Navigation ..................5 Quick Start ....................5 Controls ....................... 6 Front Panel ......................6 Per Channel Patch Points ................
  • Page 3 Wavetable Menu ..................11 Firmware Update ..................11 Update Instructions ..................11 Custom Wavetables Loading ................12 Loading Process ....................12 File Requirements .....................12 LFO Designer ...................... 13 Key Features ....................13 Visual Waveform Editor ................13 Preset System ..................... 13 Waveform Creation ..................14 Audio Preview .....................
  • Page 4: Introduction

    Introduction The ACL WT-QUAD-LFO is a wavetable-based CV generator that offers flexible and accurate signal shaping. By converting custom waveforms into CV outputs, it covers both standard LFO duties and more complex signal manipulation. Its core design lets you transform almost any shape into a precise motion, adding depth to your patches.
  • Page 5: Getting Started

    Getting Started Installation Ensure your system is powered down before installation ▪ Connect the included 16-pin power cable to your power bus, ensuring the ▪ connector is oriented correctly. Both the module and most modern bus boards use shrouded headers, which prevent incorrect cable orientation Note: During extended operation, the module's back side can reach temperatures of up to 60°C on its right side.
  • Page 6: Controls

    Controls Front Panel Each channel features dedicated inputs and outputs and operates identically. For simplicity, this manual provides a unified explanation that applies to all channels: Per Channel Patch Points Clock (CLK) Input: Accepts external ▪ clock signals to synchronize LFO CV Input: Enables external ▪...
  • Page 7: Menus

    Menus Channel Settings The Channel Settings menu allows you to configure each LFO channel's core parameters. These settings enable precise control over the waveform, frequency, synchronization, modulation, and output characteristics of each channel. Additionally, presets allow for quick recall of saved configurations. Navigation >: Use the first encoder to move through parameters ▪...
  • Page 8: Settings

    Settings Waveform Selection ▪ Choose one of the factory waveforms (Sine, Square, Saw, Tri) or any loaded WAV file for the selected LFO Frequency (Freq. Hz) Adjust the LFO frequency within a wide range, from ultra-slow modulations at ▪ 0.0032 Hz to audio-rate oscillations up to 2 kHz This setting is available only when the LFO is not externally synchronized Sync Input ▪...
  • Page 9: Main Menu

    Main Menu In the main menu it's possible to set the CV input assignment and synchronization settings for each channel, additionally managing loaded wavetables and firmware updates. CV In Assign (for each channel) Each channel CV input can modulate one of several parameters of the waveform. The input responds to voltages from -5 to +5 volts.
  • Page 10: Sync Settings

    Sync Settings Clock Mode: each LFO can operate with its own internal clock or be ▪ synchronized to an external clock using the CLK Input Clock Count: ▪ Determines the number of triggers or pulses required for the LFO to complete one full cycle Allows precise synchronization with musical events, such as one beat, one bar, or multiple bars...
  • Page 11: Wavetable Menu

    Wavetable Menu View or delete any loaded wavetable on the module. Firmware Update The Firmware Update menu option allows you to update the module's firmware. To download the latest firmware version, visit the downloads page. Update Instructions 1. Copy the firmware file (.bin) to a USB flash drive 2.
  • Page 12: Custom Wavetables Loading

    Custom Wavetables Loading Loading Process 1. Copy the .WAV files to the USB flash drive root folder 2. Safely eject the device 3. Access custom tables via the USB menu button 4. You can leave the USB flash drive inserted or remove it after loading wavetables File Requirements Format: .WAV files (16-bit, 44.1kHz)
  • Page 13: Lfo Designer

    LFO Designer http://audiophilecircuitsleague.com/lfo-designer/ The LFO Designer is a web-based tool that enables the creation of custom Low- Frequency Oscillator (LFO) waveforms through an intuitive visual interface. It generates wavetable data compatible with the WT-QUAD-LFO, allowing for unique modulation shapes and audio effects. Key Features Visual Waveform Editor Canvas-based interface for real-time waveform visualization...
  • Page 14: Waveform Creation

    Waveform Creation Choose from various waveform types: sine, ramp up/down, square, triangle, ▪ and zero Adjust amplitude, character and DC-offset per division ▪ Create slides by selecting two or more divisions and clicking the 'Slew' button ▪ Change continuously the starting and ending point of any waveform division ▪...
  • Page 15: Troubleshooting

    Troubleshooting Common Issues USB Not Recognized on the module ▪ Try formatting the USB flash drive to FAT32 or ExFAT Try an alternative USB flash drive Erratic Behavior ▪ Check for firmware updates Perform factory reset LFO Gets Out of Sync After a Longer Period of Time ▪...
  • Page 16: Faq & Support

    FAQ & Support Frequently Asked Questions Can I use wavetables from other devices? ▪ Yes, if properly formatted May require sample rate conversion to 16 bit 44.1 khz mono Maximum number of custom waves? ▪ 12 custom wavetables Manageable via USB Can I load more than 12 wavetables? ▪...

Table of Contents