should fix the problem when there are spaces in the file path

pysndfx/dsp.py

@@ -3,7 +3,7 @@
 import shlex
 from io import BufferedReader, BufferedWriter
 from subprocess import PIPE, Popen
-
+import platform
 import numpy as np
 
 from .sndfiles import (
@@ -523,7 +523,7 @@ def __call__(
                 infile.cmd_prefix if infile is not None else '-d',
                 outfile.cmd_suffix if outfile is not None else '-d',
             ] + list(map(str, self.command))),
-            posix=False,
+            posix=(True if (platform.system() == 'Windows') else False),
         )
 
         logger.debug("Running command : %s" % cmd)

pysndfx/sndfiles.py

@@ -2,7 +2,7 @@
 import shlex
 import wave
 from subprocess import PIPE, Popen
-
+import platform
 import numpy as np
 
 ENCODINGS_MAPPING = {
@@ -28,7 +28,7 @@ def __init__(self, filepath):
         super(FilePathInput, self).__init__()
         info_cmd = 'sox --i -c ' + filepath
         logger.debug("Running info command : %s" % info_cmd)
-        stdout, stderr = Popen(shlex.split(info_cmd, posix=False), stdout=PIPE, stderr=PIPE).communicate()
+        stdout, stderr = Popen(shlex.split(info_cmd, posix=(True if (platform.system() == 'Windows') else False)), stdout=PIPE, stderr=PIPE).communicate()
         self.channels = int(stdout)
         self.cmd_prefix = filepath