will it work with a Bass guitar?

I don't think it will work with any instrument that doesn't play chords (it prefers strummed chords but will process de facto chords created by finger-picking patterns for instance). It needs to know both the key you are playing in and whether it's major or minor (at least in those settings including a 3rd above or a 4th below). I am a finger-picker primarily and have had to chunk up certain guitar phrases to ensure I am feeding the unit sufficient information, so I have doubts about bass.

Does this have pitch correction (auto-tune) feature on the main vocal?

I HAVE ONE....LOVE IT.....NO PITCH CORRECT.....SORRY

will this work with different tuning such as drop D or half step down?

In my experience yes. The only thing to watch are (say) double drop tunings or other forms where the chord is modal and communicates neither a minor not major tone.

will it work with backing tracks like my voicetone G-XT

I use it with backing tracks. Bose mixer and system. Mic (from helicon) into ch 1. Guitar “” into ch2. iPod into ch 3. Tracks on iPod. Not sure if this is what you meant.

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TC Helicon HARMONY SINGER Vocal Effects Stompbox with Guitar-Controlled Harmony, Reverb and Tone

TC Helicon HARMONY SINGER Vocal Effects Stompbox with Guitar-Controlled Harmony, Reverb and Tone

Product ID: 5147087

Details

Brand
TC Helicon
Color
Blue Silver
Item Weight
1.1 Pounds
Product Dimensions
6.4"L x 5"W x
Style
Compact

🎤1-2 realistic vocal harmony voices

🎸Guitar-controlled harmony

💧3 reverb styles for lush vocals

HK$1926

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Description

🎶 Elevate your solo act with harmony magic at your fingertips!

EFFORTLESS OPERATION - Intuitive controls and momentary/latched harmony modes get you performing in seconds—no tech headaches.
ADAPTIVE TONE CONTROL - Automatic EQ, compression, de-essing, and gating ensure your voice always cuts through with clarity.
VERSATILE REVERB MODES - Choose from three rich reverb styles to elevate your vocal tone and captivate your audience.
COMPACT BATTERY POWERED - Lightweight metal chassis and 4 AA batteries make it perfect for on-the-go gigs and pedalboards with limited space.
INSTANT PRO LEVEL HARMONIES - Add 1-2 natural-sounding vocal layers synced to your guitar chords for that polished stage presence.

The TC Helicon HARMONY SINGER is a compact, battery-powered vocal effects stompbox that adds one to two guitar-controlled vocal harmony voices, enhanced by three selectable reverb styles and adaptive tone processing. Designed for musicians seeking professional vocal enhancement with easy-to-use controls, it delivers natural harmonies and polished vocal effects in a durable metal chassis.

Specifications

ASIN	B00CHGKONI
Amperage	0.3 Milliamps
Audio Output Effects	Reverb
Best Sellers Rank	#29,203 in Musical Instruments ( See Top 100 in Musical Instruments ) #19 in Vocal Effects Processors
Brand	TC Helicon
Brand Name	TC Helicon
Color	Blue, Silver
Connector Type	XLR
Controls Type	Foot Switch
Customer Reviews	4.4 out of 5 stars 725 Reviews
Global Trade Identification Number	04033653081153, 05706622023407
Hardware Interface	1/4-inch Audio
Included Components	pedal
Item Dimensions	5.25 x 3.25 x 2.25 inches
Item Dimensions L x W x H	6.4"L x 5"W x 2.85"H
Item Type Name	TC-Helicon Harmony Singer 2
Item Weight	1.1 Pounds
Manufacturer	Music Tribe US
Manufacturer Part Number	P0DDV
Model Name	996371001
Model Number	996371001
Power Source	Battery Powered
Product Dimensions	6.4"L x 5"W x 2.85"H
Set Name	Guitar + Vocals
Signal Format	Analog
Style	Compact
Unit Count	1.0 Count
Voltage	9
Warranty Description	I year parts and labor.

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