Anyway, these are the Boss ES-8 specs for loops’ input and output, maybe it’s useful to match the correct settings in the TimeFactor:

Nominal Input Level

IN 1–2, RTN 1–6, RTN 7L, RTN 7R, RTN 8L, RTN 8R, RTN VOL: -10 dBu

Maximum Input Level

IN 1–2, RTN 1–6, RTN 7L, RTN 7R, RTN 8L, RTN 8R, RTN VOL: +18 dBu

Input Impedance

IN 1, 2: 1 M ohms (Buffer: On)

Nominal Output Level

SEND 1–7, SEND 8L, SEND 8R, SEND VOL, OUT 1/L, OUT 2/R, TUNER: -10 dBu

Maximum Output Level

SEND 1–7, SEND 8L, SEND 8R, SEND VOL, OUT 1/L, OUT 2/R, TUNER: +18 dBu

Output Impedance

OUT 1/L, OUT 2/R: 1 k ohms (Buffer: On)

TUNER: 1 k ohms

Recommended Load Impedance

10 k ohms or greater