Effect-routing.md

Bus chaining

When multiple effects are in a bus, they are chained according to their order of appearance in SFZ.

Example: chained effects in bus

<region>
sample=sinewave.wav
oscillator=on
lokey=0
hikey=127
effect1=100

<effect>
//
directtomain=0
fx1tomain=100
//
bus=fx1
type=lofi
decim=100
decim_dry=0
decim_wet=100

<effect>
bus=fx1
type=fverb
reverb_type=hall
reverb_size=20
reverb_tone=90
reverb_dry=0
reverb_wet=100

Example: chained effects in default chain

<region>
sample=sinewave.wav
oscillator=on
lokey=0
hikey=127

<effect>
type=lofi
decim=100
decim_dry=0
decim_wet=100

<effect>
type=fverb
reverb_type=hall
reverb_size=20
reverb_tone=90
reverb_dry=0
reverb_wet=100

Volumes (RXP)

• effect1: range 0%-100%, gain linear
• fx1tomain: range 0%-100%, gain linear
• apan_dry: range 0.0-1.0, gain linear

Analysis 1: RXP single

Synth: RXP

SFZ template

<region>
sample=sinewave.wav
oscillator=on
effect1=100

<effect>
bus=fx1
fx1tomain=100
type=fverb
reverb_type=hall
reverb_size=20
reverb_tone=90
reverb_input=100
reverb_dry=80
reverb_wet=50

effect1	bus	fx1tomain	reverb_input	Result
				Effect is heard (high volume)
Omit	Omit	Omit		Effect is heard (moderate volume)
Omit		Omit		Effect is not heard
Omit				Effect is not heard
	Omit			Effect is heard (high volume)
		Omit		Effect is not heard
	Set to fx2			Effect is not heard
	Set to fx2	Set opcode to fx2tomain		Effect is not heard
Set opcode to effect2	Set to fx2	Set opcode to fx2tomain		Effect is heard (high volume)
Set opcode to effect2	Omit	Set opcode to fx2tomain		Effect is heard (high volume)
Set opcode to effect2	Set to fx1	Set opcode to fx2tomain		Effect is not heard
			Any value	Does not change anything
		Set opcode to fx1tomix		Effect is heard (high volume)

Note: the all-omitted case is listed as moderate volume, the explicit case is high volume.
It's because the latter mixes in another path of the dry signal (see next table below). This other path is neutralized when setting directtomain=0.

• With reverb_dry to 0

effect1	bus	fx1tomain	reverb_input	Other	Result
					Hear a mix of reverb sound and dry sound
Omit	Omit	Omit			Hear the reverb sound only
				add directtomain=0 in <effect>	Hear the reverb sound only