Alesis A6 User Manual

Chapter 8: Pre Filter, Post Filter and Voice Mixes

A

NDROMEDA 

A6 R

EFERENCE 

M

ANUAL

189

POST FILTER MIX O

VERVIEW

The 

 module contains five knobs that control the output of the Filters

going to the 

 plus the unfiltered signal levels of 

 and 

 waves

and the 

 signal.

 , like the 

 module, includes a number of 

 buttons

that are used to route mod sources to their respective destinations. You can modulate
the levels of the 

’s lowpass, highpass and bandpass (as well as the inverted

bandpass) outputs, and the level of 

’s lowpass output. The 

 knob,

which controls the unfiltered levels of 

/

 waves and 

 outputs,

can also be modulated.

POST FILTER MIX O

PERATION

The first four knobs in 

 are all level

controls for the Filters’ outputs routed to the 

as shaped by 

. We’ve already covered the

principles of these Filter functions earlier in Chapter 5
under the topics 

How Filters Are Designed

 (refer to page

117 if you need a review) and 

Signal Routing

 (see the

previous page). We’re providing a summary here.

FILTER 1 Controls

The 

 knob controls the level of 

’s low

pass filtered signal while the 

 knob controls the

level of 

’s high pass filtered signal. Both of these

knobs can be used at the same time. When they are, a

 filter is produced.

The 

 knob controls the level of 

’s band

pass filtered signal. The band of frequencies can be
inverted by pressing the 

 button.

FILTER 2 Control

The 

 knob controls the level of 

’s low

pass filtered signal.

PRE FILTER Output Control

This knob controls the level of three signals – 

(the sine wave output of 

), 

 (the sine

wave output of 

) and 

 (the output of the Ring Modulator) – that are

routed directly from the sources to the 

, bypassing the Filters. This

direct signal flow provides several distinct advantages when editing Programs,
covered in detail earlier in this manual on page 126.

To select any or all of these signals, press the respective button or buttons – all three

signals can be selected at the same time. Use the 

knob to set the initial

level. If you want independent envelope shaping of the loudness of these 

signals, press the 

 button and assign an envelope at this point in the mix.

FILTER BYPASS Button

Normally, all audio flowing through the A6 is routed to 

. And depending on

the settings of the 

 button and the 

 level knobs, 

becomes part of the mix as well. You can, however, bypass both Filters if necessary.
Pressing the 

 button disconnects both Filters from the audio path: any

sound going through the A6 is untouched. You must, however, shape the signal’s

loudness by 

 as all audio is hardwired to this envelope.