correction of ISM1 and ISM2 generation scripts; further adjustments

### Input path to mono files

input_path: "./items_mono"

### Input path to stereo impulse response files, default = './IRs'

### Input path to stereo impulse response files, default = './ivas_processing_scripts/generation/IR'

IR_path: "./IRs"

### Output path for generated test items and metadata files

### Flag for adding low-level random background noise (amplitude +-4) instead of silence; default = false (silence)

add_low_level_random_noise: true

### File designators, default is "l" for listening lab, "EN" for language, "p02" for exp and "g" for provider

### File designators, default is "l" for listening lab, "EN" for language, "p01" for exp and "g" for provider

listening_lab: "l"

language: "EN"

exp: "p02"

### l stands for the 'listening_lab' designator, e stands for the 'exp' designator (the number of consecutive letters define the length of the field) 

use_output_prefix: "leee"

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### Scene description

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