xfade.lv2 - Stereo DJ X-fade
=============================
xfade.lv2 is an audio-plugin for stereo cross-fading
2 x 2 input channels to 2 output channels.
Install
-------
Compiling this plugin requires LV2 SDK, gnu-make and a c-compiler.
```bash
git clone git://github.com/x42/xfade.lv2.git
cd xfade.lv2
make
sudo make install PREFIX=/usr
# test run
jalv.gtk http://gareus.org/oss/lv2/xfade
```
Note to packagers: The Makefile honors `PREFIX` and `DESTDIR` variables as well
as `CFLAGS`, `LDFLAGS` and `OPTIMIZATIONS` (additions to `CFLAGS`).
Signal Controls
----------------------
The plugin has 3 parameters which are interpolated and can be operated
in realtime without introducing clicks or similar effects.
### Signal A/B
Fade between Input A (left-end, -1.0) and Input B (right-end, +1.0).
### Fade Shape
Allows to smoothly choose the A/B behaviour:
* Linear (default): constant Amplitude. Out ∝ InA + InB
* Equal Power: retain signal power. Out2 ∝ InA2 + InB2
### Fade Mode
* X-fade (default): Inputs are fade over the complete range of the _Signal A/B_ control range.
* V-fade: Input A is only faded if _Signal A/B_ is > 0.0, Input B if _Signal A/B_ < 0.0
Consider the following simple diagrams:
```
Vol
^
1.0 |AA BB
| A B
| A B +-------------+
| X | X-fade mode |
| B A +-------------+
| B A
0.0 |BB AA
+-----------------> (A/B control)
-1 0 +1
Vol
^
1.0 |AAAAAAAXBBBBBBB
| B A
| B A +-------------+
| B A | V-fade mode |
| B A +-------------+
| B A
0.0 |BB AA
+-----------------> (A/B control)
-1 0 +1
```
Screenshots
-----------
xfade.lv2 running in jalv.gtk:
With Ardour3, use a 4 channel bus, bypass the VBAP-pan control and only connect Bus outputs 1&2 to the master bus:
