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Bitwig AHDSR-Envelope Modulator- Envelope with Hold Stage based Signals

Bitwig Guide | Apr 14, 2022

The AHDSR-Envelope adds a hold stage to the traditional ADSR, allowing for attack, hold, decay, sustain, and release phases, with each stage adjustable up to 10 seconds. This versatility is enhanced by features like polyphonic mode and an amount slider that can be modulated, such as with an LFO, to create dynamic and evolving sounds. The addition of the hold stage offers greater control and creative possibilities, making the envelope both interesting and useful in sound design.

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Short Overview

I enjoy using the AHDSR-Envelope because it adds a hold stage to the typical attack, decay, sustain, and release phases, giving me extra flexibility. Each stage, including hold, can be set up to 10 seconds, which really lets me shape the sound exactly how I want it. I find the amount slider and polyphonic mode especially useful, and I like modulating the envelope with an LFO to make things more dynamic. The hold stage keeps my sounds interesting over time and opens up new creative possibilities.

Introduction to AHDSR-Envelopes

In this video, I explore the concept of the AHDSR-Envelope, which is a unique type of envelope generator used in sound design and synthesis. Unlike the traditional ADSR envelope, which consists of Attack, Decay, Sustain, and Release stages, the AHDSR-Envelope introduces an additional Hold stage between Attack and Decay. This extra stage provides greater flexibility and creative options when shaping sounds.

Understanding the Stages: From ADSR to AHDSR

What is an Envelope in Synthesis?

An envelope in synthesis is a tool that shapes the dynamics of a sound over time. The most common format is the ADSR envelope:

The Addition of the Hold Stage

The core difference in an AHDSR-Envelope is the Hold stage. After the Attack phase, the Hold phase maintains the peak level for a set period before moving to the Decay phase. This means the AHDSR-Envelope has the following stages:

The Hold stage is especially useful for maintaining the energy of a sound right after the initial attack but before it begins to decay, allowing for more expressive envelopes and dynamic control.

Key Features of the AHDSR-Envelope

Extended Time Ranges

One of the features I appreciate in this particular AHDSR implementation is that every time-related stage can be set up to 10 seconds. This wide range allows for anything from snappy, percussive envelopes to long, evolving shapes that are useful in atmospheric and cinematic sounds.

Polyphonic Mode

The envelope also includes a polyphonic mode. This means that each note played can have its own independently triggered envelope, which is crucial for complex, layered sounds or when playing chords, as each note's envelope doesn't interfere with the others.

Modulation and Flexibility

An important tool provided is the amount slider, which controls how strongly the envelope affects the parameter it is modulating, like the filter cutoff. This slider can itself be modulated, for example, with an LFO (Low Frequency Oscillator), allowing for dynamic, evolving changes. For instance, when using a long Hold or other time setting, applying some LFO modulation to the amount parameter introduces movement and keeps the sound interesting over time.

Real-World Application

These features make the AHDSR-Envelope a powerful tool for sound designers. With the ability to hold the attack peak, quickly or slowly decay, sustain, and release, along with the modulation options, I can sculpt more expressive, evolving sounds. Using polyphonic mode ensures complex patches remain clear and musical even when playing chords.

Why and When to Use AHDSR

Adding a Hold stage is particularly helpful for emulating certain acoustic instruments or creative electronic sounds where you need to maintain the initial energy of the attack a bit longer. For pad sounds, it can sustain brightness before mellowing out. For drums and plucks, it allows for fine-tuning snap and body. The extended stages are great for ambient music or soundscapes, while modulation of the amount gives evolving, dynamic motion.

Summary

To sum up, the AHDSR-Envelope is a more flexible version of the standard ADSR, offering an additional Hold phase, extended time control up to 10 seconds per stage, polyphonic capabilities, and deep modulation options. These combine to make it a highly effective and creative tool in modern sound design beyond traditional envelope shapes, especially for those looking to create evolving, expressive, and nuanced sounds.

Full Video Transcription

This is what im talking about in this video. The text is transcribed by Whisper, so it might not be perfect. If you find any mistakes, please let me know.
You can also click on the timestamps to jump to the right part of the video, which should be helpful.

Click to expand Transcription

[00:00:00] The AHDSR is an envelope that features actually an hold stage here.
[00:00:05] Normally an envelope has an attack, decay, sustain, release phase, but here we have attack, hold,
[00:00:11] decay, sustain and release. So there's one stage more. Besides that it's just a regular envelope
[00:00:21] you can use. We can apply this here to the cutoff easily.
[00:00:30] So we have just one hold stage or more and the hold stage goes up to 10 seconds, which is pretty
[00:00:40] nice. In fact every setting here goes up to 10 seconds. There's also polyphonic mode and there's
[00:00:49] an amount slider here which you can use. For instance use an LFO and modulate this here.
[00:00:58] Modulate the amount. It's actually pretty helpful when you have here a phase of 10 seconds you can
[00:01:08] apply here a bit of LFO modulation to this stage which keeps it interesting over time a bit more.
[00:01:17] Increase the speed a bit.
[00:01:21] So AHDSR is an envelope but then added hold stage here. Really interesting and really helpful sometimes.