Okay, here is how its done. USE AT YOUR OWN RISK. These instructions are for MAC, so you can adapt it to Windows if thats your platform.
The 1st thing to understand is that when Serato says it "supports" a controller, it means that it has baked in all of the mappings for a particular controller into the software's compiled code. (the program)
However, if you create a custom map, Serato will use the custom map only for those commands that you customize with priority over the baked in mapping. So, what we do is exploit this feature with a manually modified mapping of the Load button.
1.) Go into Serato > Setup > Midi dialog and save the current setup for your controller as your backup. Give the file a name that signifies its a backup.
2.) Use Serato MIDI mapping feature to create a custom map of "pressing the load button" for each deck of your controller.
3.) Save the mapping to a new filename. If you are on MAC, the file should be found here: /users/YourLoginName/music/_serato_/MIDI/Xml/{SavedName}.xml.
4.) CLOSE SERATO.
5.) Copy the saved file to another location like the desktop, give it a new name and open it with a text editor such as MAC's built in TextEdit.
6.) Assuming you did the map for both decks in step #2, you will find two SECTIONS in the file which contain a command of
<load_track deck_set="Default" deck_id="0" slot_id="0">
and
<load_track deck_set="Default" deck_id="1" slot_id="0">
7.) Carefully identify the ENTIRE SECTIONS (there are two) that begin and end with the following commands:
begins with:
<control channel=
and ends with:
</control>
8.) Make a note/copy of the entire "<control channel=" line from both sections.
9.) Replace the ENTIRE SECTION for the 1st section (DECK A) with the following:
<control channel="?" event_type="Note On" control="??">
<case>
<condition>
<touch_effect_modifier deck_set="DJ Effects" deck_id="0" slot_id="1" operator="equal" cmp_value="off"/>
<effect_bank_mode deck_set="DJ Effects" deck_id="0" slot_id="0" operator="equal" cmp_value="Multi Mode"/>
</condition>
<userio event="click">
<load_track deck_set="Default" deck_id="0" slot_id="0">
<translation action_on="press" behaviour="explicit"/>
</load_track>
<effect_level_1_slot_enable deck_set="DJ Effects" deck_id="0" slot_id="1">
<translation action_on="press" behaviour="static" static_value="off"/>
</effect_level_1_slot_enable>
</userio>
<userio event="output">
<effect_level_1_slot_enable deck_set="DJ Effects" deck_id="0" slot_id="1">
<translation action_on="any">
<alias name="on" value="127"/>
<alias name="off" value="0"/>
</translation>
</effect_level_1_slot_enable>
<load_track_feedback deck_set="Default" deck_id="0" slot_id="0">
<translation action_on="any">
<alias name="off" value="0"/>
<alias name="on" value="127"/>
</translation>
</load_track_feedback>
</userio>
</case>
</control>
and for the 2nd section (DECK B) with the following:
===============================
<control channel="?" event_type="Note On" control="??">
<case>
<condition>
<touch_effect_modifier deck_set="DJ Effects" deck_id="1" slot_id="1" operator="equal" cmp_value="off"/>
<effect_bank_mode deck_set="DJ Effects" deck_id="1" slot_id="0" operator="equal" cmp_value="Multi Mode"/>
</condition>
<userio event="click">
<load_track deck_set="Default" deck_id="1" slot_id="0">
<translation action_on="press" behaviour="explicit"/>
</load_track>
<effect_level_1_slot_enable deck_set="DJ Effects" deck_id="1" slot_id="1">
<translation action_on="press" behaviour="static" static_value="off"/>
</effect_level_1_slot_enable>
</userio>
<userio event="output">
<effect_level_1_slot_enable deck_set="DJ Effects" deck_id="1" slot_id="1">
<translation action_on="any">
<alias name="on" value="127"/>
<alias name="off" value="0"/>
</translation>
</effect_level_1_slot_enable>
<load_track_feedback deck_set="Default" deck_id="1" slot_id="0">
<translation action_on="any">
<alias name="off" value="0"/>
<alias name="on" value="127"/>
</translation>
</load_track_feedback>
</userio>
</case>
</control>
10.) Replace the question marks (?) (??) with the values you noted in step #8.
11.) Save and copy the file back to its original location, /users/YourLoginName/music/_serato_/MIDI/Xml/{SavedName}.xml, open Serato and load the new file via Serato > Setup > MIDI.
* If it was done right, no error occurs and loading a new track should reset the effect in slot 1 of Serato Fx rack. I keep EchoOut in slot #1.
* The behavior of your controller may be a little different in terms of the load button or FX status illumination when you manually manipulate he Fx on/off/on, but the functionality will remain which should not affect your workflow.
DISCLAIMER: I bear no responsibility for any ill-effect as a result of the fore-going instruction. Use at your own risk.
