Taking in mind that there exists a variety, there are few things that are with your consideration. Use these tips at any time and you will make a better choice.
Harmonies are one of the most prominent features of the voice pedals. It is really a nice thing to be able to add one more harmony to tune being sung. Often, guitars or instrument is used to change the harmonies automatically and fit the chords on play. You would have to mechanically set the key for each song and change the patches to intervals within a key if it is not for the smart guitar controlled harmony. Different pedals will have varying number of simultaneous harmonies ranging from one to four voices. It is possible to change the character of the voice in diverse ways such as time variations and pitch.
Auto tune is the second factor to look at on the voice pedal. The pitch correct, which has rocked some genres of music is used to correct tuning problems and create distinct sounds. It proves so practical when you need help with song tough songs or want the sound of Kayne West, T-pain or some other popular musician. It allows you to control the outcome of the pulling off the pitch if your sound to the destined one. A lower speed and modest adjustment is nice if you are looking for a natural sound. This is because the hard tune locks the voice so quickly and it can warble if you drift. For most vocal pedals, they allow setting to a chromatic mode if getting near the tune.
If you are buying the vocal pedals or the process, you want to give attention to the vocal effects and the looping. Having consistent control of the primary voice effect such as the EQ, compression and reverb is a big reason for buying the voice pedal. In fact, some of the pedals only have these basic functionalities. Most of the processors allow character changing of the voice using the formant shifting. This feature lightens or deepens the character of a sound and artificially changes the gender and age of the singer. Such effects have increased in the popularity owing to the tonal effect. Sometimes, they are used for harmony with female or male style backups.
The guitar effects help from the smart chord-based harmonies. The guitar effects have been added to many pedals to make it an all performance unit. In most cases, they are tailored for the acoustic players offering the reverb, modulation and delay filters. These are effects that you will want to use if you play the guitar and want to keep the rig simple.