Описанная ситуация характерна для усилителей с петлей без буфера, хотя, в современных усилителях такое встречается редко. В любом случае, длина проводов 10 м и наличие true-bypass (если он есть в педали) играет роль. В таком случае и длина проводов и несовпадение входных импедансов педалей и петли ухудшают сигнал
Лечится с помощью буфера в цепи или буферизованной петли - блендера, вроде One-Сontrol Moscuite Blender BJF Buffer (если очень хочется сделать из последовательной петли параллельную с функцией kill-dry).
Однако,это все в теории, а в данной ситуации с 6100lm все намного сложнее
Во первых, надо проверить селектор петли serial/parallel и привести в нужный вид (предполагаю, что Serial, если педаль не в режиме kill-dry, хотя, производитель рекомендует параллельную петлю для ревера)
Во вторых проверить уровни fx send trims -10 + 4 dB для обоих каналов.
В третьих проверить кнопку loop level и ее действие (выбор между - 10 + 4 db)
В четвертых проверить не включена ли кнопка PUSH TO MUTE POWER AMP INPUT OR TO ACTIVATE LINE INPUT, которая переключает line input / line output в режим второй петли.
В пятых последовать вот этой рекомендации по согласованию уровней сигнала в петле (переводить лень): On 41 & 42 - When setting up the effects loop, the effects processor’s level controls should be set up against the lead
channel -3 and matched using switch (44), then channels 1 & 2 set up via the trim controls for an effects send balance. If desired, more or less sound level can be set for differing amounts of effected signal.
Ну, и наконец, внимательно вникнуть в мануал, там целая страница посвящена мучению с этими странными замороченными петлями
Operations notes D, E, F
Operational Note D: Series effects option
Items 38 & 40 can also be used as a 2nd series effects loop (See operational note F). The selection switch (Item 39) will
switch the loop in or out of the circuit, but will not mute the power amp.
41. Effects Send Trim Channel 1 Provides -10 to +4db level control of the effects send
from Channel 1 only.
42. Effects Send Trim Channel 2 Provides -10 to +4db level control of the effects send
from Channel 2.
Operational Note E: Effects level balancing
On 41 & 42 - When setting up the effects loop, the effects processor’s level controls should be set up against the lead
channel -3 and matched using switch (44), then channels 1 & 2 set up via the trim controls for an effects send balance.
If desired, more or less sound level can be set for differing amounts of effected signal.
43. Series/Parallel Selection Switch Selects series or parallel effects loop operation. Series
connection is most suitable for Graphic Equalizers,
compressor limiters etc. Parallel connection suits delay,
reverb and chorus effects. It is generally not advisable
to link distortion effects through the loop.
Operational Note F: Effects Loop
The main effects loop on this amplifier can be configured either as a series or a parallel loop by using the
series/parallel selection switch (item 43). The parallel loop (switch out) splits the pre-amp signal into two, retaining the
direct signal within the amplifier itself, whilst sending a parallel signal out to the effects processor. By turning the direct
signal within the processor to zero only an effects signal is returned to the amplifier where it will be mixed back in with
the direct signal. This leaves the original direct signal uncoloured by any circuitry within the processor. By using the
effects level control (item 28) your ideal mix of dry and effects signal can be easily set up.
The series loop (switch in) diverts the whole pre-amp signal through the effects loop and switches off the internal direct
signal. The effects level control (28) now acts as an overall master level control.
In terms of application, units that are time based (eg Chorus, Delay, Reverb etc) are best suited to the parallel loop.
Real time effects (eg. Graphic or Parametric EQ, Compressors etc.) suit series loop operation.
It is worth noting that the line in (40) and line out (38) circuit could be used as a series effects loop at 0 dBm, giving
you the ability to use both types of loop simultaneously
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