Roland VP-550 Manuale Proprietario

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If you press the [VOCODER 1] and [VOCODER 2] sound buttons simultaneously, the sound being received 
from the rear panel [EXT IN] jack will be used as the carrier (the signal that is the foundation of the sound).
In this case, turn the rear panel [MIX TO MIC] switch “OFF.”
Connect your external synthesizer to the [EXT IN] jack as shown.
OUTPUT
If you’re using a mic that’s equipped with a phone plug, you won’t be able to connect your synthesizer 
since the [EXT IN] jack will be occupied by your mic. In order to connect an external synthesizer, you
must use a mic with an XLR plug and connect it to the [MIC] jack.
Turn the [EXT IN] knob to “LINE.”
This knob adjusts the level of the signal that’s input from the [EXT IN] jack. (Turn the knob toward 
“MIC” to increase the level, or toward “LINE” to decrease it.) If you’re connecting a line-level device
such as a synthesizer, set the knob toward the “LINE” position.
Turn the [MIX TO MIC] switch “OFF.”
The [MIX TO MIC] switch selects whether the sound from the [EXT IN] jack is used as the mic input 
(modulator) (ON) or as the carrier (OFF). Since we’re using this sound as the carrier, select the “OFF” 
position.
Press [VOCODER 1] and [VOCODER 2] simultaneously.
1.
*
2.
3.
4.
Using the sound of an  external synthesizer 
( EXT  IN)