Ashdown Bass Envelope Plus 2010s - Silver

The Ashdown Envelope Filter is a bass specific unit providing a wide

range of automatic filter opening and closing or ‘sweeping’ effects.

Although the controls perform similar functions to other Envelope

Filter effects you will find that a much wider range of effects are

available from this unit than from most Envelope Filter effects

pedals. More of the reasons for this below.

An Envelope Filter effect is simply a variable Band Pass or Low Pass

electronic filter circuit where the ‘sweep’ through its filter range is

controlled by the level of signal passing through the unit. In other

words the device is dynamically controlled by the player i.e. the

harder the note is played the greater the frequency range through

which the sweep of the filter passes. This Sweep can usually be

chosen to be in an Upward direction i.e. the filter frequency

increases with an increase in signal level or in a Downward direction

i.e. the filter starts at a high frequency and sweeps downward with

the degree of sweep following the signal level.

It is important to set the Input level to the correct reading on the VU

meter as this will affect the range and sensitivity of the envelope

filter.