diff --git a/audioop.py b/audioop.py
index 26f99cc..856dc1f 100644
--- a/audioop.py
+++ b/audioop.py
@@ -18,7 +18,7 @@ STRUCT_FORMAT = {
 	4: ['I', 'i']
 }
 
-class error(Excpetion)
+class error(Exception):
 	'''
 	This exception is raised on all errors, such as unknown number of bytes per sample, etc.
 	'''
@@ -43,10 +43,10 @@ def _get_raw_sample(cp, size: int, i: int, signed=True):
 	struct_format = STRUCT_FORMAT[size][signed]
 	start = i * size
 	end = start + size
-	return struct.unpack_from(struct_format, buffer(fragment)[start:end])[0]
+	return struct.unpack_from(struct_format, memoryview(cp)[start:end])[0]
 
 def _get_samples(cp, size: int, signed=True):
-	for i in range(len(cp) / size):
+	for i in range(math.ceil(len(cp) / size)):
 		yield _get_raw_sample(cp, size, i, signed)	
 
 def _set_raw_sample(cp, size: int, i: int, val, signed=True):
@@ -64,7 +64,7 @@ def _overflow(val, size, signed=True):
 	else:
 		return val % 2**bits
 
-def getsample(fragment, size: int, index: int):
+def getsample(cp, size: int, index: int):
 	'''
 	Return the value of sample index from the fragment.
 	'''
@@ -89,7 +89,7 @@ def minmax(fragment, size):
 	_check_parameters(len(fragment), size)
 	sample_min = 0x7FFFFFFF
 	sample_max = -0x80000000
-	for sample in _get_samples(fragment, size)
+	for sample in _get_samples(fragment, size):
 		sample_min = builtin_min(sample, sample_min)
 		sample_max = builtin_min(sample, sample_max)
 	return sample_min, sample_max
@@ -139,32 +139,32 @@ def findfit(fragment, reference):
 	len1 = len(cp1) / 2
 	len2 = len(cp2) / 2
 
-    sum_ri_2 = _sum2(cp2, cp2, len2)
-    sum_aij_2 = _sum2(cp1, cp1, len2)
-    sum_aij_ri = _sum2(cp1, cp2, len2)
+	sum_ri_2 = _sum2(cp2, cp2, len2)
+	sum_aij_2 = _sum2(cp1, cp1, len2)
+	sum_aij_ri = _sum2(cp1, cp2, len2)
 
-    #result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) / sum_aij_2
-    result = (sum_ri_2*sum_aij_2 - sum_aij_ri**2) / sum_aij_2
+	#result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) / sum_aij_2
+	result = (sum_ri_2*sum_aij_2 - sum_aij_ri**2) / sum_aij_2
 
-    best_result = result
-    best_j = 0
+	best_result = result
+	best_j = 0
 
-    for j in range(1, len1-len2):
-        aj_m1 = _get_raw_sample(cp1, 2, j-1)
-        aj_lm1 = _get_raw_sample(cp1, 2, j+len2-1)
-        
-        # sum_aij_2 = sum_aij_2 + aj_lm1*aj_lm1 - aj_m1*aj_m1
-        sum_aij_2 += aj_lm1**2 - aj_m1**2
-        sum_aij_ri = _sum2(buffer(cp1)[j*2:], cp2, len2)
+	for j in range(1, len1-len2):
+		aj_m1 = _get_raw_sample(cp1, 2, j-1)
+		aj_lm1 = _get_raw_sample(cp1, 2, j+len2-1)
+		
+		# sum_aij_2 = sum_aij_2 + aj_lm1*aj_lm1 - aj_m1*aj_m1
+		sum_aij_2 += aj_lm1**2 - aj_m1**2
+		sum_aij_ri = _sum2(memoryview(cp1)[j*2:], cp2, len2)
 
-        # result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) / sum_aij_2
-        result = (sum_ri_2*sum_aij_2 - sum_aij_ri**2) / sum_aij_2
+		# result = (sum_ri_2*sum_aij_2 - sum_aij_ri*sum_aij_ri) / sum_aij_2
+		result = (sum_ri_2*sum_aij_2 - sum_aij_ri**2) / sum_aij_2
 
-        if result < best_result:
-        	best_result = result
-        	best_j = j
+		if result < best_result:
+			best_result = result
+			best_j = j
 
-	factor = _sum2(buffer(cp1)[best_j*2:], cp2, len2) / sum_ri_2
+	factor = _sum2(memoryview(cp1)[best_j*2:], cp2, len2) / sum_ri_2
 	return best_j, factor
 
 def findfactor(fragment, reference):
@@ -208,17 +208,17 @@ def findmax(fragment, length):
 
 	result = _sum2(cp1, cp1, length)
 
-    best_result = result
-    best_j = 0
+	best_result = result
+	best_j = 0
 
-    for j in range(1, len1-length):
-        aj_m1 = _get_raw_sample(cp1, 2, j-1)
-        aj_lm1 = _get_raw_sample(cp1, 2, j+length-1)
+	for j in range(1, len1-length):
+		aj_m1 = _get_raw_sample(cp1, 2, j-1)
+		aj_lm1 = _get_raw_sample(cp1, 2, j+length-1)
 
-        # result = result + aj_lm1*aj_lm1 - aj_m1*aj_m1
-        result += aj_lm1**2 - aj_m1**2
+		# result = result + aj_lm1*aj_lm1 - aj_m1*aj_m1
+		result += aj_lm1**2 - aj_m1**2
 
-        if result < best_result:
+		if result < best_result:
 			best_result = result
 			best_j = j
 
@@ -508,12 +508,12 @@ def ratecv(fragment, size, nchannels, inrate, outrate, state, weightA=1, weightB
 	ncp = 0
 
 	while True:
-		while d < 0;
+		while d < 0:
 			if nbr_frames == 0:
 				samps = zip(prev_i, cur_i)
 				rv = cp.raw
 				trim_i = (ncp * bytes_per_frame) - len(rv)
-				rv = buffer(rv)[:trim_i]
+				rv = memoryview(rv)[:trim_i]
 				return (rv, (d, tuple(samps)))
 
 			for chan in range(nchannels):