But the issue on Boss PSA type (9VDC) and ACA type (9VAC) are entirely cured upon using psu with chains.
Proof: Boss ACA types uses 9V batteries right?. Meaning, Boss ACA types are using DC circuits. They use silicon diodes before the current limiter to convert the 9VAC to 9VDC. But using psu with or chaining other pedals may bypass the silicon diode through the sleeve of the patch cables. Gets nyo ba?