Volume drop is a common issue; using a 3x loop pedal with gain can help mitigate it.

Vintage pedals like the Shin-ei FY-2 tend to perform better with carbon zinc batteries, as they align with the technology of the era, over alkaline or rechargeable ones.

The Wattson version fixes the volume drop but offers a different sound profile compared to the original Shin-ei FY-2.

The FY-2 features two transistors, while the Univox Superfuzz (FY-6) contains more gain stages, offering a different tonal character.

The Shaftesbury Superfuzz, a similar circuit to the Univox, includes a switch for a mid-focused sound, offering versatility.

The EQD Terminal and Wattson Fuzz are mentioned as alternatives, with the Wattson capturing the aggressive bite of the original Shin-ei FY-2.

Not ideal for open chords; excels with power chords and single notes, creating a distinct sound.

Fredric Effects offers the Super Unpleasant Companion, combining both the Companion and Superfuzz circuits with an additional tone switch not found in the original.

The Shin-ei Companion Fuzz Wah provides a unique sonic filter effect in its wah feature, offering substantial bite and range without overpowering the fuzz, unlike other wah pedals.

Known for its use in late 60s fuzz tones and can be heard in Blur's 'Charmless Man'.

Adding a volume boost after the pedal, like an LPB-1, can address the inherent volume drop.

The FY-2 is described as producing a "chainsaw" sound, highlighting its aggressive tonal nature.

Owners describe the sound as "gnarly" and "like a buzzing bee in a tin can," emphasizing the pedal's unique and aggressive tonal character.

Clean vintage units of the Shin-ei Companion can be found for around £250, with some sellers attempting to price them at £400 or more, though they may sell for less if monitored closely.

Vintage models might require switch replacements, but often retain pristine pots, indicating excellent durability in certain components despite age.